Yeah, I got to play around with one of these briefly at a local shop the other day. From the five minutes or so that I spent with it, I was impressed. They had it set up on a Ruger SR-556... although I did not like it with the Magpul AFG that they had it on (but I dont really care for the AFG anyway), it would be great for use with a true vertical grip.
The Green laser is a vast improvement of the red. Much brighter, and way easier for the eye to pick up..... especially at distance and in a bright environment. Overall the unit seemed very well made (everything I have seen by LaserLyte up to this point has been as well) and the pressure switch worked great too. Really liked it a lot.
*BTW It also comes in tan