Actually, I have never really been interested in a canister filter, but that could be because I have never had one. I have always liked my HOBs but because of the potential of fry from my Angels and hopefully my Cories, I'm really considering all Sponge filters. The mattenfilter is a great idea, but I didn't want to make that much fuss with my current plant layout and I would have to disturb well established plants in one of my back corners if I implemented a mattenfilter. Thanks for the suggestion though.
I agree. It always helps to have them around in case of an emergency.