I use the Quik Clip for basting with a fabric tagging gun. I put the needle in, pick up 1/8" of the backing and come back up through the top, slide the Quik Clip under the needle and pull the trigger. Takes a lot longer to describe it than to do it. :)
I use the 1/4" long barbs and the gun/barbs made for fine fabrics and I can baste a queen size quilt in about 15 or 20 minutes - about 2 hours less than it takes with pins.
I LOVE fusible batts - you don't have to use pins or barbs at all, but I still use some, just to keep the strain off of the glue bond. The fusible glue washes out after a couple of launderings and the quilt is soft and drape-y.
The fusible batts are especially good when you have bought a quilt top that isn't well pieced or hasn't been properly pressed during its assembly.
With a steam iron and fusible batting, you can just about beat those "bad quilts" into submission. Costs a few bucks more, but worth it for the lessened frustration factor. :)