I just got an Evolve 8 on clearance from Petco. Mine appears to have been opened and then returned, and it's considerably scratched up. I'm using it for gammarus shrimp and snails, so the scratches aren't an issue and were mostly visible before I set it up. (The included coupons expired in 2012, so I know this tank has been sitting on the shelf for a while.)
However, the pump is very loud and way too strong - creating a very strong current through the entire tank on the lowest setting. I set the tank up in my bedroom, so have to unplug the pump in order to sleep. I had the pump securely placed on the bottom of the reservoir, all 4 suction cups firmly attached. I ordered a 40 gph pump from Amazon to see if it's quieter - I have 2 smaller nano tanks set up with 40 gph pumps, and they are silent.
I love the Evolve 8, and want another one. They are now kind of hard to find, tho. Are they still being made? I much prefer something like this over the cheaper plastic 1 and 2 gallon tanks. I'd also welcome a larger sized Evolve, but I understand the cost/pricing issue. Being on clearance was a small factor in my purchase, the bigger selling point was the day/night LED, hidden filtration, and tank size.