I haven't tried that one, but I did buy a green laser off of ebay last year. It was rated at 5mW, but I think it was underrated. I've read that most of these chinese lasers on ebay are actually more powerful than they claim to be.
It was TOO bright for indoor use. If I shined the green light on the wall, it hurt my eyes just to look at it. U could also see the beam, and it lit up a dark room like a flashlight. It was visible to at least 800 yards at night (probably further, I just had nothing further away to shine it on), and U could see it at 100 yards during the day.
I ended up selling it because it was just too bright for what I wanted it for - mainly indoor use. Now, for strictly outdoor use, it would have been nice - U could have sighted it in at 100 yards. But, I didn't think it was safe for the eyes, and I sold it to someone who wanted it strictly for outdoor use.
Now, the laser U talked about - I've read mixed stuff about it on AR15.com - I also don't think it is as bright as the one I got from ebay. I've read some people claim to be disappointed in the brightness.
All I can offer...