I have a Big Shot, and although it is very nice, it just doesn't work best FOR ME. There are so many individual preferences in this sport, and the fact that I prefer other gloves (and tabs) doesn't detract from the way the Big Shot works for others. As with bows, quivers, arrows, broadheads, etc., try as many different ones as you can and buy what works best for you. I wear size large in pretty much every glove I have tried, including the Big Shot. If in doubt, I would tend to go with the smaller size, because the finger stalls tend to pull away from my fingers on the Big Shot, so you want them to start out pretty tight, as Gordon has said. I find the thickness of the finger stalls to be a problem, and shooting fairly heavy bows with thinner stalls doesn't seem to hurt me, so I choose the lack of bulk.
Allan