Yeah I have some interest but I am waiting to see which is better the Aqueon Evolve or the Pen Plax. Which is like asking which brand of cheap Gas is better I know.
Well, coincidentally, I just bought an Aqueon Evolve 8 (Petco giftcard for Christmas).
For one thing, it's acrylic and the penn plax tanks are glass. I'm not super thrilled with the integrated filter system. It's a 2 chamber overflow design that draws water through a filter cartridge (I hate filter cartridges, but that's another subject) by means of a power head that is sat in the second chamber. The power head outlet is attached by a hose to a nozzle at the top of the chamber that points into the tank itself. The nozzle is mildly adjustable. Not my choice for a filter set up, but it works allright so far.
Things I really don't like about the aqueon:
The lid is reeeeaaallly cheap.
The LED light is ok. The "lunar light" feature is way too bright. Like someone turned a blue light bulb on. That said, I doubt the penn plax light is much better.
The worst part so far is the overflow chamber design. The chamber that holds the filter cartridge is about 6 inches deep. The other chamber is about 10 inches deep. The problem is that the second chamber travels under the first. So you have a cave that is impossible to reach into underneath that first chamber. The first day I spent about 4 hours trying to get a shrimp out of that cave.
After that it wasn't terribly hard to shrimp proof the overflow system, so hopefully I won't have to go spelunking after shrimp anymore.
It should work well enough, but it certainly has some issues. The advantage of the Penn Plax in my opinion, is that you can get the tank without the "integrated" components.
Crappy lid that falls into the tank unless positioned just right:
Overflow system. The black foam was not included and is part of my shrimp proofing:
The other side of the overflow system. You can't see it in the pic, but this side extends under the other side: