Raggiemom, I've only used fleece on baby quilts so I can't give advice on anything larger. Just remember there is alot of stretch from selvage to selvage and not as much lengthwise. I use regular batting (Warm and Natural or 80/20) in my mug rugs and have never had a problem. If I am making hot pads for the table I use a layer of both Insulbrite and batting.
I was able to finish my 3D cube quilt and trimmed the edges. Located yardage in my stash for a backing and chose and binding as well. I'm trying to decide how I want to machine quilt it so for now it's on the design wall while I ponder the possibilities.