I've handled the new CT user-installed Glock lasers. It's an elegant solution and one that has been long coming.
Jim Cirillo opines that these things make the Glock fit his hand better than a Glock ever has before. It could be that they change the ergonomics slightly for the better, though I have to say here that I didn't notice any appreciable difference so that will probably be a very individual thing.
Looking forward to seeing CT get these on the market. Last I heard there were still a couple of minor production issues getting worked out, though my info is probably out of date by now.
pax