We have used fleece for the back on one quilt. My FIL takes dialysis three times per week and is always cold while he is there and just after he leaves. We have done a quilt for him (not bound yet) that used fleece as the back, and also has a layer of batting in the middle. It quilted beautifully. The great thing was I pulled almost NO LINT out of the bobbin area of the quilter. I suspect all the lint got imbedded in the fleece as I was quilting.
The quilt is amazingly warm. My wife put it over me one night when I had fallen asleep on the couch and I woke up sweating.
We will definitely use fleece again.
We hope to finish the quilt soon and will post pictures then.
Darren