I have wondered this same thing. I have a Crimson Trace Linq on on one of my rigs, god-dammit if it doesn't work well. Cost is the only thing keeping me from a second. Current thought is to get a Inforce WML and figure out how to offset mount it on a Sig MCX.
I have a TRL-1 HL on my H&K P30 nightstand gun. It is also the issued light on our department sidearm (also a H&K p30, but I had mine first
). I really like them.