Pros: does the work - no odor from the litterbox
Cons: tracks around the box a bit
Been using Ever Clean for a while now and we're happy with it. It certainly is effective when it comes to odor control which is probably the most important aspect, for me, being that the box is very near my office room. I clean the box twice a day, and in between, there's rarely any odors (unless someone gets lazy and doesn't cover up, which happens from time to time, making me go and clean up after them).
There is a fair amount of litter around the box, but I have still to find the litter that leaves zero tracks.