Very good sprayer for its price! You can spray up to 4 meters high easily! The only problem is the straps! Simply terrible! They broke on the very first use, when you see them you realize they are of low quality, they definitely are NOT suitable to withstand a 25L sprayer! Other than that, perfect sprayer!

I got it for a small plot with 30-35 trees.
4 stars because, as mentioned by another user, the sealing at the supply hose with the coupling is not good. The hose has a butterfly at the end to tighten onto the coupling but with use it loosens. As a result, on the very first spraying attempt, my pants got soaked with copper solution, as instead of spraying, the liquid was escaping from the connection point.
I fixed it by gluing it with special glue and special Teflon.
Otherwise, sturdy, quality operation, excellent pressure... it’s a pleasure to spray.
I highly recommend it.

So, after about 10 sprays in olive groves, it's time for the initial evaluation of the machine.
Positives. The machine starts right away. I immediately changed to an NGK spark plug and mixed it with a ratio of 40ml/1lt of Amsoil Saber oil.
I follow the instructions with more oil for the first 20+ hours of use. Then I will decrease it to 25ml.
It has power. It sprays comfortably and covers large olive trees with the pressure lever at 2-3 turns out of the total 7 it has. Also, the throttle is slightly above the middle depending on the use, but I never needed to put it on full throttle.
For up to 1.5 hours of use, it starts and stops for refueling 7-8 times, but it has no problem, it works perfectly.
It is comfortable on the back once you put it on. It would be good to have a small table with you because it is not easy to lift a total of 35 kilograms.

Negatives. The plastic parts. The filter box already broke at one point because it is too close to the cord and I grabbed it with my hand. Also, the gas lever broke a piece, I found it somewhere in the packaging.
The rubber where it connects does not make the best contact and loosens, so you have to tighten it regularly. I made another rubber with a gun and connected it with a 1/4 adapter and Teflon tape. It has not opened again. Be careful, the adapter is not exactly 1/4, it is slightly smaller, so it is good to get the same hose from a store.
The gun is not the best, but it does its job. However, you will see a difference with a better gun.
The belts are terrible. It is good to replace them or have a second set because they will easily wear out.

Conclusion, for its price, 90€, it is very good and infinitely better than a battery sprayer for 50€, it's like day and night.

Guys, the machine works perfectly, it is quite powerful for my 5-meter tall olive trees. It sprays 7 trees at maximum, but I had difficulty connecting it. The instructions are poorly written and the printing is not clear on the base

Excellent for amateur use, starts very easily. I use it for spraying 130 olive trees once or twice a year, with one tank filling you can fully spray 7-8 adult trees. Easy to use, it also includes a low-pressure nozzle for grass. The only drawback is its weight with a 25-liter tank (requires strong backs).