As much as I "love" to save a dollar as much as anyone else, please tread lightly with ANY of these brand filters. I've "almost" bought 1 or 2 just to tinker with(I have a basement fish room I would use/test them in, but I still wouldn't want a flood even down there), but in the long run I decided against it. They're really just a powerhead in a "can" with sponge around it, not a well designed filtration unit.
I've seen quite a few stories like this:
http://www.aquaticquotient.com/foru...88-Beware-of-Odyssea-CFS-500-Canister-Filters
Now I'm NOT saying it can't happen with ANY canister, but, I dunno...
Do a good google search on CFS canister lid cracks or CFS canister leaks, oversized rubber seals on the knockoff "aquastop" valves(copied from Fluval), and "HAVING" to mod it right off the "bat" for NORMAL operation due to inconsistencies in manufacture.
ALL canisters have the ability to leak, ESPECIALLY the way some folks are so HEAVY HANDED, but I'd almost put my (2) Aquatop and (2) SunSun 304/404B's up against my Eheim 2262 and Fluval FX5 & FX6 anyday. SO much in fact I don't even use the FX's and Eheim...YET(all still in box waiting for 300gal HOPEFULLY THIS SUMMER, wife permitting)
People have to realize, it's NOT about FLOW, it's about COMPLETE DENITRIFICATION, and most people DON'T need anywhere as much BIO as they think they do....
Really re-evaluate your bio-load. If the Sunsun/Aquatops "clones" were handling your load, why would you sell them? If you needed more flow, use Koralia powerheads. NO filter is going to catch ALL of the detritus if that is your mission....
Best of luck, and be careful. I look forward to your review if you DO still get one. And here's another tidbit or two for ya:
Keep us posted....