Almost all of my baby blankets are made with the satin backings. ALL babies love the feel of the satin. Even my guys many years ago loved the feel of satin.
I use the flannel backed satin for my backs. The flannel 'holds on' to the batting really well. I have had no issues hand quilting with it. I have machine quilted with it and have been able to have great results. The only concession was that I had to quilt it in sections. There is not much stretch in the FBS so it is really pretty easy to work with. HTH
BTW I usually make a 'lovie' blanket at the same time with the same materials. I make it about 18"sq. That way they have a quilt large enough to cover and wrap and the same 'feel' in a smaller version for the car seat and to carry around as they get bigger.