I have one myself, and I do like it - however a few comments:
The tanks tend to be quite high rather than long - bettas being air breathers like to be fairly close to the surface most of the time, so this is not the ideal type of tank for these fish.
You don't get a lot of tank for your money, as it uses fancy curved glass rather than being a regular rectangle shape.
The plastic corner pieces can vibrate with the pump causing noise, and are also prone to dropping off.
The depth of the tank makes maintenance a bit awkward compared to a standard 'long' tank.
I'm actually contemplating selling it and just getting a standard rectangular tank as it will fit the space better. I thought i'd give you some food for thought.
Cheers,
Max