The Lasermax guide rod laser sight was easy to install (check out Utube to actually see the installation).
This is a blinking laser, as opposed to steady on. Seems to be right on target for 21 feet. As part of the gun, there is reason to believe that it will stay properly targeted regardless of the number of rounds you fire.
A slight negative - I found that the on/off switch (the take-down lever) falls right under my thumb in the two hand grip and the recoil of a shot sometimes causes the activation/deactivation of the laser.
As with all such devices, target acquisition is a snap.
Yes, a bit pricy even with price match to other on line sellers.
Pros: Neat, clean, fully contained, pre set (no adjustments)
Cons: On/off switch inadvertently activated/deactivated
This review was written in the old system and had content requirements that are different than reviews written today.