I have a Crimson Trace on my Gen3 27. I bought the pistol used and already set up. Did not have the little wrench to adjust the laser so I called Crimson Trace. Told them it was used and asked how much it would cost to ship me the wrench. Even though it was a used grip, they sent 8 wrenches for free, signed me up for free batteries for life, sent one new set of batteries, an instruction manual, gave me a free one-year warranty, and sent me a catalog, all for free. I don't care if a laser costs half as much as a Crimson Trace, I will pay the extra. They have a customer for life because of their customer service.
Alright I shot this thing but I don't think I zeroed in very, it was my first time shooting my 19 so I was really focused on just the gun. Made some slight adjustments but the target I was using had a little to much going so it was hard to see where I hit. Need to put it out a little further to I think only put it out about 10 ft. Once i figure that it'll be awesome!