I have had it on my G26 for a couple of weeks now and thought I would share some of my thoughts... First let me say that I had mixed feelings about this doo-hickey even after I installed it. My mind was pretty much set on "the safety is between your ears" and "don't pull the trigger" etc. but my lovely wife asked me to try this "for her" to give her peace of mind when we are both handling the gun or for when I pack the gun in an unorthodox way (i.e. without a holster). She is very used to guns with safeties and so am I even though we both use and love the Glock and the M&P without the external safeties. I don't know if that makes sense but anyway, I decided to give the thing a try and figured if it sucked or I felt that it would hinder me in any way during training I would can it faster than a week old newspaper. So without further ado, here we go: Installation - The instructions that come with the kit are kind of lame and leave out some important details. Most importantly - you WILL damage or destroy your original trigger removing it from the trigger bar. It can be gotten around if you go slow and drill a tiny hole in the other side of the trigger to get the pin out but again, there is nothing in the instructions about this. After you get the gun apart and remove the original trigger from the bar you have to re-insert the trigger bar assembly and then attach the new trigger to the old trigger bar. It's a little trickier than it looks but once you get everything lined up it's a snap. Note that the new trigger body itslef is slightly larger than the stock trigger so if you ever need to remove the trigger assembly after installing the Siderlock you will have to detach the trigger first. This can be a minor or a major annoyance depending on how often you need to remove your trigger assembly. For me it is not a problem. I also put a couple of dots of super glue on the ends of the pin holes to make sure the pins dont work loose. I don't know if this is necessary but it makes me feel better and can be easily undone if I choose to do so later. All in all it took me about 30 minutes from start to finish. I am no gunsmith and this is my first Glock so some of that time was figuring out how to remove the trigger assembly from the gun. Otherwise I am pretty skilled with hand tools and I would rate the exercise as medium difficulty. That said, if you have any doubts about being able to do this take it to a 'smith. He or she should be able to do it without breaking a sweat or your wallet. Function - It's very simple to use and does not affect the normal operation of the trigger with the safety disengaged. In fact, I like the smoothness of the Siderlock trigger more than the stock serrated trigger it replaced. The thing I like best about the device is that it gives me a choice. I like to keep the gun ready with one in the chamber and I can just flick the safety and leave it on when I throw it in my bag or pack and not have to worry something catching the trigger while moving about and causing an AD. When I carry it on my person in a holster I can just flick the safety off before I holster the gun and it's ready to go just as if it weren't there. Even if I forgot to disengage the safety it only takes a millisecond to disengage and is simple enough to check while you draw if you practice enough with it (yes, I have been practicing with it). As I said, I also like the trigger that comes with it. It's very smooth and has a postive natural feel to it with the safety disengaged. With the safety engaged there is no way to pull the trigger even if you forcefully pull on it. You will probably damage the gun's frame before you damage the trigger and it would take a mighty hefty pull to do that. Bottom line, you are not pulling the trigger accidentally or otherwise while the safety is engaged. The safety actuator botton itself is some kind of alloy and has a very positive feel to it. It's hard enough that it won't get depressed with a glacing touch yet easy enough to disengage with a touch of your index finger. It is very easy to make this a fluid motion when you are ready to fire and the button disengages with a positive click that tells you you are ready to rock and roll. One thing I have heard from some detractors of this device is they say that it's dangerous to have to push a button located on the trigger. After actually using the thing I will say that the design of the trigger and the button make it very positive from a tactile point of view and it is very easy to work with a minimum of fumbling. You are pushing the button sideways so you are not moving the the trigger forward or backward and the way the Glock trigger works with the built-in trigger safety, it is very difficult if not impossible to pull the trigger while working the safety button. I have tried to make this happen with the gun unloaded and I could not do it. My guess is that this argument is mostly made by folks who have never seen or used the Siderlock in person. In any case this is only my opinion and others may still disagree on this point. I am satisfied and confident that I can safely operate the device without accidentally pulling the trigger. YMMV. Summary - All in all it's a very nice addition to the Glock. Could I live without it if I had to? Sure, but that's the cool thing IMHO...I now have the choice. I don't know if it will stay on the gun forvever but the bottom line for me is that it does what I wanted it to do and is very unobtrusive and works very well and it gives me some piece of mind in those situations where I felt like I needed an extra layer of safety. Now I know some of you guys like to flame away on stuff like this and that's fine, I totally understand not wanting to have this device on YOUR Glock and I wholeheartedly support you. All I ask is that instead of posting negativity in this thread, please change the channel to another thread or start your own thread about how Glocks are perfect without additional safeties etc. This review is for the folks who are interested in this device and considering purchasing one. Stay safe out there and God bless. -Frank Wanna kill these ads? We can help!