For our twins we got 2 different ones, one from another company, so in comparison:
1) When you turn it upside down, no water leaks (essential for babies).
2) It doesn't rust anywhere (while the other one developed rust on the handle that can't be removed).
3) Both the handle and the straw can be removed from the base and washed well.
At first, it's hard for the baby to suck, but soon it softens and it's just fine.

If it didn't leak, I would give it a 10.... But it leaks and makes everything wet...

Unlike the plastic cup from the same company that was perfect, the metal one leaks water. This is because it has a plastic washer inside, which moves out of place, resulting in a gap that allows water to pass through.

Pros: it has a durable construction and does not alter the taste of the water... However, this anti-drop barrier it has on the straw prevents the child from drinking water, resulting in them not quenching their thirst, so I give them a bottle of water and they drink and quench their thirst. Even I had to use force to drink... I tried to slightly open the straw internally so I wouldn't waste €25. Also, when I give it to them to drink, the cap falls on their face many times. These anti-drop cups are the worst, they don't allow the child to enjoy their water, it drips like a dropper and they have to use their lungs first.

While it is convenient for the child to hold and open it by themselves, which we liked a lot, the straw broke immediately - a very dangerous fact that a piece could break off and the child could swallow it!!! And the rubber seal inside the lid, if it comes out, is very difficult to put back in. Overall disappointment.

Very good cup. My daughter has had it for a while and it keeps the water cool, but unfortunately you can't put anything else in it because the straw doesn't clean easily and collects dirt where it bends, and unfortunately there is no replacement straw

In the positives, the build quality is good, it is stainless steel so the water doesn't smell, the spout is large so it is relatively easier to clean compared to other two that I have tried, and the handles are comfortable to hold. I read in the comments that the straw doesn't hold up, however, my child doesn't bite it, so it doesn't currently pose a problem for us. One minus star because it is difficult to suck, it requires a lot of force and I wonder why they make it so difficult, I can't even drink comfortably myself.

The straw is so thin that it didn't last even a month. I have a similar munchkin for two years and neither the straw nor anything else has broken.

The 2-year-old toddler, while being difficult in the water, drank from this directly. It maintains the temperature and has no leaks. Very good choice.

Excellent but you need to screw it very specifically otherwise it loses liquids in any case. My little one has been using it since she was 14 months old and there hasn't been any damage yet with the straw, as I read from others here... we'll see

Perfect, it keeps the water cool.

I got it for a 13-month-old baby, but it's probably actually for 18+ because it's heavy with water and they can't easily lift it to drink.

We have had it for almost 10 months only for water because the straw is difficult to clean.
It was convenient for me because the child could easily open it without needing to hold the straw.
The little one bit and cut the straw and there is no replacement.
I chose stainless steel instead of plastic because it is better in terms of quality and would last.. BUT there are no replacements.
I will prefer another one that has replacements

The cup is very good in many aspects as it has been mentioned and it really is one of the best we have had so far (this was missing, it used to cost 20€). We should have had it for 6-7 months already. Everything was fine until the child just had a little strength and bites/cuts the straw and you can't find replacements. So here you throw away the whole sippy cup... Yesterday I would have given it 5 stars, today after a bite, we're down to 1.

Very high quality and keeps the drink cool for many hours. The only negative thing I can mention is its weight! I consider it very heavy for small hands

We have had it for almost a month and the little one uses it daily without any problems! Very good!

Use only for water in 18+ girls.
Positive: It doesn't leak and maintains temperature.
Negative: It doesn't clean the straw easily, I haven't found a replacement straw as the baby has bitten/cut it (correct me if there is), and most importantly, in our case, it doesn't suck easily, which makes it difficult for the child to easily drink their water.
Due to the difficulty of cleaning, we only use it for water.

Beautiful, if the milk is very hot it spills.. I was looking for a glass that could also be used for milk.. Second month and we are satisfied

Good quality cup, the child drank immediately with a straw without difficulty (16 months). It doesn't leak and keeps the water cool, the little one seems to enjoy it and drinks more water than before. We will also try it with milk for a change from the bottle, as the instructions say it can be used for milk and juice. It looks great!

Very good, now it will show how long it will last, but compared to some cheaper ones we had, it is perfect, we have no problem. It doesn't leak and personally, my little one sucks without any problem.

Update: for its price, there should be a replacement straw... I will buy a new one, but not yours, I'm saying this in case you are trying to do by not having replacements in Greece!!

It has safety and you have to make a strong effort to suck... in the end it gets tired and doesn't drink... disappointing...

It is exactly as it appears, it is practical, the water does not leak from the lid, so it is perfectly safe to transport it in a bag, the opening and closing is very easy and its exterior surface does not easily get dirty or damage its metallic appearance, the only negative thing I would say is that it does not have a large capacity, so it needs relatively frequent refilling, which for me personally, has not been a problem so far!

The main thing is that the child uses it on their own, holds it easily, it is not huge and that is good. It easily sucks water, not like some others, and water does not spill!!! It is presentable, convenient, has handles, keeps the water cool. The child enjoys drinking water.

It doesn't leak at all and maintains the temperature. Not for too many hours, of course. It's more expensive compared to others in the same category, but rather than collecting water... I prefer it.

It keeps the water cool for hours.
Easy opening and closing by the child.
Relatively easy to clean.

The only negative is that it does not have the weight inside that the classic cup has.