This was our first con sketch purchase that worked out. We tried to get one at Baltimore ComicCon last year from Mark Texeira but he took our money and ran. Thankfully Finch does his sketches while you wait, so there isn't any paying for something you don't get, or trying to chase him down later to find out if he finished your piece. I like the Finch method better. It might make standing in line take longer, but at least you get instant gratification, plus you can talk to the artist a bit while he draws, which is pretty cool.
Thanks Finch! We love it! Keep up the good work!