the recoil of the G23 is stronger than other .40 cal handguns I have shot, but I found it is quite manageable with a little practice. The only thing I really don't like is the finger grooves in the grip. I like the Gen 2s much more than the Gen 3s.
Although, I haven't had a chance to shoot a Gen 4 with the biggest back strap w/ beavertail, which I think would make it much more comfortable, allowing a higher grip without fear of slide bite.