RazerZ :
Nice find, I would say its the best option and would be even cooler if you could easily mount it on your gun
Duct tape
Anyway, if you look at the videos of that one it's colours are a little off and the videos are OK, but not great. I find the monoprice one is a much better buy and I would be willing to trust it a whole lot more.
The examples on the deal extreme one seem usable though, if all you want to do is e-mail a kill-reel to your unsuspecting friends then it's probably fine.