SL20X Terralux Drop in, has anyone tried it?

I was doing some flashlight research tonight, thinking of a getting a Terralux drop in for my FIL's 2D Maglite when I stumbled across their drop in for the Streamlight SL20X. they rate the thing at 600 lumens. Almost makes me want to go out and by an SL20X, I have used the things for years and they are a tough good quality duty light, and if I can get 600 lumens out of one I might need to get it. I just wondered if anyone has tried one of these bad boys and if it is everything it is cracked up to be.