sewNso, i bought a sample of silk batting at a quilt show years ago. IMHO it's like 'they' say it is, it quilts like butter. It is pretty thin, but I couldn't say how it will roll up on the frame as I only have a small piece (about 15" square). I'm going to use it on a Tennessee Waltz quilt that has some batiks and hand dyed fabrics in it.
My favorite batting that I use all the time is Fairfield's Softtouch. I have a hard time finding it in stores and have started ordering it on-line. I can't remember if they have different lofts or if the Softouch is just the one type. I don't hear a lot of people talking about it but for some reason I like it better than all the other popular batts. Create for Less is where I found it on-line.