That's a bit pricey for an eBay deal. You could probably do a few hundred better with some careful searching/watching.
Speaking of beam specs though, remember that this is a diode ARRAY, not a diode. Basically, its a bunch of laser beams side by side, not a single one. Divergence out of each diode is on the order of 10+ degrees, not mRads, so collimation/focusing is necessary for pumping or pretty much anything, and collimating separate diodes is a pain in the butt!
If you're just looking for cheap burning power though, it combined with a large lens could be pretty insane. I think I have a >20W of those somewhere around here.
I wouldn't listen to the 30W green claim though. It may be possible, but 10W is a much more realistic estimate.
And remember, the water cooling isn't for decoration! Its a must even if you're just lasing for a few seconds at a time.
