I went to the local pet store to buy a filter for my new 29gal. I had planned on buying an Emp 400 until I saw they were priced at $87!!! I know I could get one online for about $30 or $40 but I didn't want to wait. But I saw what I thought was an Emp 280 for about $40 so I went ahead and bought it. When I got home and went to set it up I realized I grabbed a new Penguin 200 Biowheel. I was kinda bummed, but I guess it's pretty much like the Emps but just w/o the spraybar and shorter pads. So has anyone else used these? Got any comments on them? The one I got is super quiet, but I have had a problem with it quitting every now and then. I just have to pull up on the propeller and reseat it. Not sure why though.