I like how the tank look, BUT very disappointed on how thin the glass that they use. I recently shop for an all-in-one tank and Fluval Flex was my first choice but when I saw it in person from one of the LFS in our area, lifted the box, it's very light weight so I asked the owner of the store if I can check the tank inside and the reason why it's so light is because of the thickness of the glass. I don't trust the longevity of the glass plus sometime we accidentally bump our tanks with something and with that in my head, I didn't pull the trigger for it. I went with the Nuvo Fusion Nano series tank instead. Much better built quality. Off course I only got the tank only because the light that came with the Nuvo Fusion is for saltwater. =)
Good luck. Fluval Flex, very nice design but I don't trust the thickness of the glass. That's my opinion though..