I've now bought two of these - despite being very delicate (almost flimsy), somewhat basic in style and probably not the most durable item, it works incredibly well in particular circumstances.
Firstly, if you want to avoid unsightly drilling or unreliable suction cup fittings, it gives you a simple toilet roll dispenser at a standard bathroom height that you can position according to preference, the rolls are easy to replace and you can store 3 spare rolls close at hand (which help to stabilise the unit a bit, but not totally). The roll doesn't fall off the unit when you're accessing it, but you will need both hands to avoid Andrex-puppy-style "unravelling"! I do like not having to worry about a permanent drilled bathroom fixture that I might want to change for stylistic reasons or want to re-position.
Secondly, the square frame and straight lines enable you to position the unit neatly - particularly in corners - or against walls, either side-on or front-on, without inhibiting access to the roll dispenser. In my small bathrooms this actually helps with space management and keeps the room looking neat, and obviously the roll storage adds to the space-saving. I also found a little trick - you can use small suction-cup hooks to 'anchor' the unit against tiles near the base and once the spare rolls are in you can't see the hooks at all. This anchoring helps, since the unit is so light that even with 4 full toilet rolls in place it can easily be knocked over.
Nothing fancy here, just a quite efficient use of space and a non-permanent, neat 'straight-line' solution for small bathrooms.