Yeah I like the XDs a lot. I have an XD-40 and an XDM-9mm. I got the 40 in 2005 and the XDM right when they came out at the end of 2008. I plan to keep this on the 40 though.
Derek, you might be able to find a holster that will work. A couple of holster companies make holsters specifically for handguns with these attachments.
xjwmx, I've seen those on youtube. They can pop balloons. What are you going to do with it? Shine the bad guy in the eye?
I am Carbon, I have a friend that has a green one and that's what convinced me to go green vs red. It's quite impressive at night and in low light situations. During daylight on light targets it's harder to see.