I've been wanting a Tac Light for my PF-9 and my son gifted me with this one.
It's a Springfield Insight XML. I'm saving up to get the X2L which is a combo tac light and laser. They run around $200.
This makes a nice addition for at home at night. I keep my PF-9 by my bed when not carrying it. I like it that no tools are needed to take the light on and off. There's a spring loaded catch.