It's a cantaloupe engage currently. It only wants a chip anyway, but even if I had a g11, you can't fully swipe a card because it's in a depression. I think simply making the bubble front like previous models would resolve this (flat metal on right, bubble front on the rest). I also don't care for the confusing button setup but that's a minor issue.
Also, I guess a factory worker used an impact to screw the 11/32 nuts on so tight that they actually imbedded in the bill acceptor where the studs are lol. Not a design issue though.
Overall, the 721 is fantastic. If I could recommend one simple change (not including the card reader issue), it would be to put some kind of marker or point of reference on the bottom rotor so you know where to put the slides for 16oz energy drinks. We sell so many but it's hard to see well when we prep the machines. We just test vemd it to confirm the slide is good for 3-deep but it seems simple to put a mark on the rotor.