I used one for about 8 months then gave up, cleaning the filter was a pain and it was hard to clean down inside some of the smaller spots, and I knew there was slimy guck in there but couldn't get at it. The water pump got all gross and it's impossible to clean inside of it. In the end I gave it to the Goodwill. The one I bought was from Canadian Tire, here it is:
http://www.canadiantire.ca/browse/pr...08474396672759
I don't think I'd ever use one again unless they could make it out of metal or glass and make it way easier to clean. But I'm a freak when it comes to clean.