I have the curved safety pins and Kwik Klip too, but about 10 years ago I started using Microtach to baste my quilts, for everything from small to queen-sized quilts. I saw it advertised in a magazine and researched it on the internet. I found one quilt shop in North Carolina that sold it.. I called them and asked if it could be used for quilting. They said 'Yes, they use it for quilting all the time,' so I ordered it and tried it out and have been using it ever since. It has a fine needle and fine nylon fasteners. I buy refills at ACMoore in their sewing section. (This is not the big basting gun sold at JoAnn's that has big plastic fasteners that leave big holes in the quilt. )
I slide a plastic grid underneath the quilt as I baste.
This method is much easier for me to use than safety pins. It makes a large quilt much lighter to handle than a quilt weighed down with safety pins. One big advantage to me is that I don't have to remove or maneuver around safety pins as I machine quilt - especially with free motion quilting. I try not to sew over the little nylon thingys, as that can make it a little trickier to remove them later, but it is no big deal if I do sew over them. In over 10 years of using them, I only broke one needle. Not sure why I broke that needle. Can't necessarily blame it on the little nylon fastener.