I just received my 5 gal Penn Plax. The best part about it is the tank itself. That being said, the filter and plastic top are about as cheap as they could be, but are functional.
The light is ridiculous. It is 0.6 watts and could serve as a moonlight at best. It is so cheap there isn't even an on/off switch and you have to unplug it to turn it off!
It looks like a real hassle to return [I bought it through Amazon from another seller] or I would definitely send it back for a refund.
All that being said, it's still a decent upgrade from my betta's 3 gal bowl which had no filtration. The filter does seem to pull water through and there is an opening at the back for heater and filter cords. And a top to keep him from jumping out.