Easy assembly, beautiful appearance, and good functionality. However, I give it 2 stars for quality. Chinese plastics and it leaks (a little) already from the first day (fortunately at the base where the water supply connects), while the manual says listen carefully: due to heat and expansion, it is normal to have small leaks!!! I disagree with the other review that it is only enough for 1 person. At a quick pace, 3 people can barely take a shower (of course, turning off the water while soaping). Finally, I would expect the water to become warmer with 35C heat, so you can mix it with a little cold to get more, but you turn it all the way to hot and it is exactly the ideal temperature.

Easy assembly, nice appearance. For drilling into concrete, you will need a hammer drill. A simple percussion drill driver will tire you out. Also, it is better to buy metal anchors (metal plugs) for fastening and not the ones included in the package. Cost 4€ for all 4.
I deduct 2 stars though because the 20lt run out very quickly. One person washing their hair with shampoo finishes it.
It is better to choose a model with 40lt.
For durability, I cannot tell you because we have only had it for 2 weeks.
P.S: After 2 years, everything is fine.