I looked at these a while back. Came to the conclusion that I take enough stuff to the range as it is, including an Oehler 35 chrono, and that I didn't need another bulky piece of range gear to lug around. I also came to the conclusion that IF, I mean IF, I was to get a range camera system it would be the Bullseye Camera system, simply because of the compactness.
An expensive spotter? I have a good hunting spotter, a Leupold Gold Ring, but no, the camera is less $$ and batteries are cheap. Set up time takes two minutes more, big deal.
I went ahead and bought one. I like the how it can measures your groups for you too, cool.