Fleece lover here, although its mixed in with my wool and PUL covers which I also love.
I have 1 RB and 1 Heavenly Heiney FIO. And just yesterday I got a Littlebums fleece pull-on (its 2 layers of 200wt, reversible!), and a couple of now-too-small stacinator fleece covers. I like how soft they are. (o yeah, a starbums monkey fleece AIO
I keep looking at some of the FIOs on the TP and "almost" buying them. I love them that much. Plus, its fun to talk to non-CD people about fleece for diapers b/c in the past decade or so its become such a popular fabric and I think folks are amazed at the versatility of its properties. I was sceptical of it for a diaper cover, but its just great!
We used the new pull-on fleece cover last night and it held up perfectly even with heavy night pee'ing.