Very good quality, sturdy construction, easy installation. The holes due to size require a professional drill.

Let me start with the size, which is not clear from the photo. It is large, a real beast, but its size is not bothersome after installation.
The installation is a relatively easy process, but to drill into the cement, you will probably need a professional hammer drill because you will be using a 14mm drill bit (I'm not 100% sure about the millimeters, but I remember that it didn't fit in my conventional drill and I needed a larger chuck). Other than that, there are 4 special screws that are extremely easy to use, just be careful not to widen the holes too much when drilling. The Allen screws went in easily (it says torque tightening, but despite having a torque wrench, I did it by hand).
The bearings went in with one hit, I read that some people couldn't get them in, but I used a 500gr hammer. It has very informative instructions (as if you need them for the process).
In terms of functionality, it is excellent, I can easily put on and take off my chain.
I would like to remind you that if you get this, it would be good to also use a chain/lock of similar quality so that the chain is not the weak point.
Also, I want to mention that it requires a wheel to be cut, and it definitely won't be easy to cut.
Value for Money: Excellent

The only difficulty is to place the balls on the screws so that no one can unscrew them.
It requires a lot of force. If you place it on the ground, things are easier on a wall, almost impossible.