I recommend the vanilla flavor because it is the most neutral of the rest and the safest. I got it because I can't gain weight easily due to my metabolism and thyroid. The reason I don't give 5 stars is because I've only been using it for about a month and I don't know how well it helps. Shake I recommend for calories: 300 ml whole milk: ~200 calories 1 scoop Serious Mass: ~625 calories 1 heaping tablespoon peanut butter: ~120 calories 20g oats: ~75 calories close to 1000 calories and it doesn't upset your stomach. I'm drinking it right now as I'm writing this text and 30 minutes ago I had lunch. Note: I have a very sensitive stomach and get nauseous easily. With this protein, I never had a problem. If I manage to reach my goal, I will update the review.

Stay away from the cookies if you have sensitivities in your gut, the 5 stars are for the plain flavors which are fine

No intestinal or stomach problems, Choclte & Peanut Butter flavor is excellent, just a bit too sweet. I take 1 scoop a day, it does its job just fine.

I think there is nothing else at this price... if you want to gain weight it's the only way... everything is as it should be, ingredients, taste, solubility (in a blender), and the brand is a guarantee..

You will gain weight and muscle mass but if you stop taking it you lose them very quickly probably because it is not whey

It dissolves just fine with a plastic shaker or a wire ball inside. I had no issues with my gut or stomach, which I usually do. Chocolate flavor, very good, not like others that start to get tiring after the 2nd or 3rd day, that's all. Now we'll see with the weight if it gives a boost.
Edit: I got the Cookies flavor and it wrecked my gut... Stick to the simple flavors.

Nice banana flavor, effective protein as I saw an increase of about 2 kilos in less than a month, but it could also be from the carbohydrates it contains. When mixing it by hand (shaker), it leaves some undissolved bits. But it's not like it will remain undissolved! FIRST WATER IN THE SHAKER AND THEN THE PROTEIN!! Not the other way around.
I used it as follows: 1 scoop in 300-350 ml of water. 2 times a day. So that I consume the 2 scoops daily as recommended.

I will also add my comment... Disappointment... I have been involved with supplements and nutrition for 15 years, I have never had such stomach discomfort with any other protein... I trusted the company because it has reputable supplements. Except for this particular protein... Firstly, it does not dissolve as most people mention in the comments, and if you put 200 grams of protein in 400ml of water for example, as I did, it feels like slime in your mouth... I am trying to describe it so someone can understand what it’s like... imagine putting 334 grams of protein in 710ml of water as they suggest... I didn’t even attempt it... in short, it went to the trash... I will also agree with a comment someone made about this "protein". (Get a whey and have peace of mind)* and we will get the extra calories from food... That’s all... I hope I didn’t tire you out..!

Perfect product, but the strawberry flavor is quite sweet on its own, the best is to mix it with a chocolate flavor and it becomes simply perfect.

I got the biscuit flavor, it tastes amazing, and it's very easy to dissolve, I mix it with milk and shake it by hand for 30 seconds

Came with 2 snacks and fast delivery,worth every penny

The taste is very sweet with milk. I do not recommend it to people taking it for the first time. Initially, it does not dissolve easily in a shaker by hand, it needs a blender to melt. Otherwise, you have to shake it in the shaker for 10 minutes and still have pieces. Also, the scoop is huge and this one says 50g of protein for two scoops. Where the two scoops are a whole shaker, not even the milk fits. Finally, even with one scoop that I put, I cannot eat anything else for two hours. It bloats me a lot due to the calories it has. Buy it at your own risk.

I ended up choosing this specific protein because it was recommended to me since I wanted to gain volume. But they didn't tell me the negatives.
Firstly, it doesn't dissolve easily at all, especially in a shaker, so don't even bother. It will leave big chunks even if the shaker has a mesh.
Secondly, I tried it with a blender first and then with a frappe mixer. In both cases, I noticed that out of 100%, about 35% or a little more is just foam. It's not drinkable, unless you let it settle first and then drink it, but what's the point if you don't get it on time.
Other than that, yes, I have gained weight as I wanted, but this is mainly due to the high sugar content in the protein.

If you want to gain weight, this will give it to you immediately. But... To put it in Greek and always with a little exaggeration, the carbohydrates it contains are pure sugar. It's like eating a cake in every shake, how can you not gain weight...? But keep in mind that when you stop taking it, you'll lose it all because you're no longer consuming 1000 calories or more... So, get a whey protein and have peace of mind.

Excellent taste and quality, worth its money for those who have difficulty gaining weight easily and quickly. The only thing that bothered me is the solubility because it does not dissolve easily and you may eat some small pieces when drinking, nevertheless I would buy it again.

Kids, you gain weight with this formula because besides having everything in it and giving you strength and a lot of intensity, it also has a lot of calories and sugar. (It's like eating a cake in every shake.)

That's why you may have noticed that the weight is temporary and as soon as you stop it, you lose it. Because you no longer consume as many calories and they go away...

I believe that if you want to take it, at first you should take a little more than you need but have cut out the extra sugar, and then stop this protein and take a clean type like whey isolate and so on, and do your job correctly and relatively healthy. Also, the price difference says it all compared to an isolate... 65€ for 4.5 kg while a whey has 65€ for 2 kg...

P.S.
I also consider it unhealthy and many have noticed changes in their behavior like irritability and such. I do not recommend it for teenagers who don't gain weight no matter how much they eat. Take pure protein and go to bed early...

As a supplement, it does an excellent job, it is 3 in 1: protein, carbohydrates, and 3g of creatine (enough for the majority of people out there). You save unnecessary expenses from creatine. I have been using it for a month now and with the proper diet, I have already gained 3-4 kilograms, which are very clean. Use a good diet application correctly and use it as a supplement. Stay consistent!