Fantastic product that cannot be beaten for the price. Easily some of the best sights you can buy. I had no problems with shipping, receiving the wrong product, or a used product (as some reviews indicate). Overall very satisfied with my purchase.Pros:-Bright tritium inserts, inside rubber anti-shock bushing with sapphire caps for excellent visibility in low-light and dark conditions. These puppies are BRIGHT, I have no problem at all seeing them in the dark.-Solid metal construction, feels like a durable, quality product. Leagues above stock sights or sights that feel like plastic. I feel these sights will last a long time even with a fair amount of abuse.-Intelligent design and execution. The rear sight widens towards the front allowing your eye to track the front blade through a greater horizontal angle. Serrations on the back of the rear sight all but eliminate glare and the rear sight extends to the back of the slide for longer sight picture. The front blade is narrow for pinpoint accuracy and the dayglow orange dot is easy for your eye to pick up and track. These sights are fast for instinctive shooting but also allow for a high level of accuracy when needed, a great balance between speed and accuracy overall.-Sturdy tight fit to the slide without the need for pins, punches, or tiny allen keys/hex wrench. The last set of sights I had used two .050 hex screws to fix the sight in place and they were a nightmare to remove or adjust.Cons:-These sights required hand-fitting for my Glock 19. This wasn't a problem for me but might be for you and does require some tools. If you already have a good file, a sight pusher, a 3/16ths narrow-neck socket with a flat face, some Loctite, and some Patience and knowhow you are good to go. Otherwise, be prepared to buy those tools or have your local gunsmith do some work for you.-No instructions. For better or worse, Trijicon does not hold your hand here. They expect that you already know how to fit your sights or that you will take your firearm and sights to someone who does for professional installation. It's not difficult to do, but you may have to watch a few videos online if you haven't done it before. (might be a con for some people)