I have made several quilts entirely of apholstery fabric.
One I paired up with another cotton for a child's 9 patch quilt. I think it would have been better if I got a heavier cotton for the sashing.
I have a TON of fabric books from those designer stores. Always always always wash first. Most of mine shrank 20% or more. Some 9 patch blocks I picked one sample to cover two 4 1/2" squares...I barely got one out of them after I washed them. They fray like mad so you'll want to watch that too. I know some people think they are a real pain to work with, other's think they make good scrappy quilts. It's going to be a matter of experience and what you want to do or try versus something you would rather not do.
I like them, but I've never quilted them. I've always tie tacked them. Just easier for me to get them completed faster as many of them are for charity.