Your review is well written and I believe helpful to anyone thinking of further complicating their weapon. The reason I bought a Glock is its wonderful simplicity ......... a home defense gun for my wife to use should I be away. No levers to work ........ just pick up the weapon and pull the trigger ....... nothing could be simplier and believe me you will WANT "simple" should you ever have the mis- fortune of having to defend your life. Even the most simplest motor skills can become confused wild actions. I have told this story before on forums ........ I had a new Flashlight that turned on a little differently than most. I had been using that flashlight for about 2 months, enough time to be use to its functioning - I thought ? One night an emergency occurred in my neighborhood and I ran outside with the flashlight attached to my belt, as usual. The emergency became a life and death situation and I needed a flashlight. Becauase of the adrenlin ........ I could not get that flashlight to turn on ......... not even when my life depended on it and maybe because it did ? In a PANIC, I fumbled with that damn light with NO success. After the incident was over ........ I walked over to the ground where I threw the Flashlight,Picked it up and turned it ON like I had done it a million times before. Lesson here : Under extreme stress - even the simplist actions can become impossible to accomplish. It's hard to know how much training is sufficient to over-come this stress related "retardation" until the life threatening action really happens. Should you need your Glock to work ........say when someone is shooting at you ....... you might not even remember the Siderlock was even installed on your Glock ....... and maybe like me start to panic over why your weapon is not working.........???? Of course, if this weapon is just a range gun ,then no worries. I have nothing against a manual Safety ..... but you MUST train with it ALL the time, not just occasionally. It must be part of the firing sequence as with a 1911 as an example. But for self defense ........SIMPLE ....is better ......... and always will be !!! JF.