Most of that person's reviews are based on selling fabric, so I would be cautious. I found another one who's reviews are on the quilting:
http://www.ebay.com/itm/HAND-GUIDED-...#ht_500wt_1156
I definitely agree with doing some research and asking for references. Aren't there any LA quilters near you? What about asking at a LQS or a quilt guild? I would also research those referrals, but at least they would be local, though I know people who have sent quilts out of state for quilting.