Had mine a good few years - easy to use and user friendly and despite what some say you can (with a little ingenuity and some cable ties) mount it to pretty much most guns, I've even used it on Webley Seniors/Juniors.

Best thing is the back up - shoot it/break a bit (most of us do at some time!) and pop it back to the owner and for a very reasonable fee it will come back good as new.