I purchased the Streamlight after a little research. I have not seen the new Insights close up, but I have used a few of the older versions, namely the old M3, and they just didn't feel as quality as the TLR-1. The TLR-1 looks to be every bit as nice as the Surefire, and I like its metal construction and $100 price tag. The Insight is a lighter choice, if that appeals to you. One of my partners that runs the older Insight on his duty light does so mainly because of the ease of taking it on a off, which he does a lot. Mine stays on the gun permanently, so that wasn't as big a feature to me.