No major gripes I've seen just far, aside from the price and some fussing about the hip joints being somewhat limited in motion and a little weird-looking to some eyes.
Likely to be tricky to pin down specific covers now, though. There've been so many the concept's been entirely devalued as actual exclusives. It's just a shame that occasionally there's a nice piece of art that gets kept away from the A and B covers that people might actually see and consider picking up an issue for.