I used the "cheap" minky from JoAnn's and regretted it. I thought it would be nice to have the soft bumpy texture on the front so I pieced it with flannel. I pressed the bumps right out of it. I was so disgusted. I was told, after the fact, that you need to use a half inch seam allowance. Also, afterward, I checked the washing instructions and saw that you cannot put it in the dryer.
This might be a different story if you bought quality fabric from a quilt shop.