http://www.youtube.com/v/O2TpthXjhec&list=UUeoWxI-gfYeBlndwqeUkBgw&index=1&feature=plcp&HD=1I shot my Gen 4 Glock 19 for the first time this morning. It operated reliably, shot accurately and was very controllable.
The Heinie sights provide a slightly high POI, unfortunately. The Recoil if anything seems lighter than normal so perhaps the new recoil system is reducing felt recoil.
Click the link for a full screen video review with accuracy test.