Owner of the double system (upper and lower pulley). Satisfied with the capabilities it offers although I believe that the upper pulley needs extra support beyond the 4 iron hooks it has. Negatives include that the rope for the lower pulley is nylon and not the classic wire for pulleys, so it can break (I ordered an extra to replace it) as well as the height of the base for the weights which implies that if you want to increase the weight, you need larger discs, e.g., 1x20kg and not 4x5kg because they won't fit (I also ordered a larger base from another store).

Solid construction, withstands a lot of weight.
I would not recommend it for use on a single balance beam, it's better if you have a hook on the ceiling of the room because the wire is indeed quite long.
In conclusion, a good choice for exercises performed on the cable machine at the gym

Expensive for what it provides as a package. Very long wire, resulting in the need to move excessively and not being able to do basic exercises comfortably and correctly. Make it yourself, it doesn't cost anything, just the time to search.

Excellent affordable pulley system with many workout attachments and very good quality for the money it costs.