Gail,
I've used the C & C in my bobbin and on the machine. I'm not a thread snob, I know a lot of folks only use certain threads. You'll find your favorites with time.
From what I've read in a number Quilting Magazines, C & C quilting and craft thread ranks up there with the others. Don't get me wrong, I use the 'good threads' when I'm doing a special wedding quilt or something but for children's quilts that are going to be washed a lot, or for teens that are going to drag them to the yard..........yeah, I use a lot of C & C. If it doesn't fray when sewing, I use it!
Just my humble opinion,
Sharon