I love fleece as a backing. It quilts beautifully, the stitches sink in really well and are buried in the back so it hides slight tension issues, and it feels cuddly and soft. I piece my backs when needed, no problem. I use a wider seam allowance when doing it, around an inch or so. I also use batting on my fleece quilts so they're extra warm and substantial. I tend to use larger quilting designs when using fleece as a backing so they'll be more puffy, although fleece also looks nice with more dense quilting. Good luck!