I have that tank at work and I'm not thrilled with the filter on it at all. There's no way it's rated at 35 gph and if it is, someone's out of thier mind. No way..if the water goes down more than an inch, it stops flowing all together. From owning that tank and filter, I'd say it's fine. I actually started with a betta in that tank and he was very happy. Really it's not strong at all.
I have the 5 gallon corner; very similar to this tank. The filter is very weak and I also doubt it has 35GHP. Also, it isnt very reliable. The wate runs over the filter cartridge instead of through it, and the water level has to be on the top for it to actually work.