Let me start by saying the ONLY experience I have with weapon mounted lights is the Streamlight TLR-3 that sits on the XD45. I am wanting this for my glocks, but only plan on buying one more. I know the x300 is way more expensive and I could essentially have more than one Streamlight for the cost of the x300 alone. My question is this, is the x300 worth the extra cash? I'm no gun snob, I don't have to have the best thing out there. BUT I want something I can depend on. The TLR-3 is amazing, and small. I just want to try something else for my carry guns. Any opinions and thoughts would be appreciated. Just no pissing contests here please.