I just switched over to fleece about a week ago, I could smell pee after about three days, but thats because my boys weren't potty trained and aren't use to it yet, they don't seem to care about peeing in their dish that I put in with bedding. I've liked both the fleece and bedding, I think fleece looks a bit better and it's nice and soft for them.
Only problem is Tigger has a habit of trying to pull it up as if he doesn't want it there lol....I've sawn ribbon on each side and tie it to the cage, so he's able to lift it up a little but not able to completely so it probably bugs him knowing he can't lol.
I was thinking about switching back to bedding since they just haven't gotten use to or even really tried peeing in the dish. I just changed the fleece probably three days ago, and even though they don't use the dish, I can't really smell anything, but since they don't use the dish, I like to swtich the bedding more often, every couple days instead of every week.