Yup Izy - those look about the same size as mine. And they nestle way down in the fabric so really, NO snagging! I guess it just boils down to personal preference. Luckily a kind friend let me have a go with hers before I invested - she machine quilts so couldn't say how it would work for hand quilting. I used it on Lily's lap quilt that I made following Izy's d9p tute!
I know you can get a 'basting grate' but my friend and now I use your technique of the pinning first then spread fingers on the back. I really couldn't kneel on the floor anymore to baste with needle and thread - old age creeping up and I get 'house maid's knee'! LOL (actually it bloomin hurts!)
K x