I am currently using minky for a backing for the first time. I have used fleece for many backings before though. I like to piece so my quilts generally have lots of seams, and if I use minky again I will add batting, it is thinner and my thick seams are obvious to the touch (but not so much to the sight). I don't know how useful my experience is to you b/c I quilt all mine qayg, but keep my backing solid and stitch and flip joined rows, so all straight line quilting so far it is going very well.
[ATTACH=CONFIG]618702[/ATTACH]
[ATTACH=CONFIG]618704[/ATTACH]
[ATTACH=CONFIG]618705[/ATTACH]
[ATTACH=CONFIG]618706[/ATTACH]
This is what the quilting looks like on the minky side, the stitching isn't as obvious as this I tried to get the light to reflect and stand out the stitching.