I will give ya the short version - as I've written a long, detailed on this post previously.
Last Dec, I bought a green laser for about $85 on Ebay - it came from Hong Kong. On Ar15.com - someone wrote a positive review of it on their PS90 - so I gave it a shot.
The problem was that it was TOO bright. These things are more powerful than their claimed 5 mW power - they are usually 10 mW. To import them, I think it needs to be 5 mW max, and no one is really checking these things, I guess. Anyway - it lit up a dark room like a flashlight almost. Plus, U could see the actual beam. And, if looking at the dot any closer than 25 feet, your eyes hurt. It was TOO damn bright,a nd really useless indoors.
Now, in sunlight, U could see the beam over 100 yards away. And, at night, it was rated for over 1000 yards. I tried it at about 800 yards and easily saw the beam.
It makes a good toy at the 100 yard outdoor range. But, I wanted a laser for indoor use - to be able to shoot it at 7-10 yards w/o using the optic, which is sighted in at 50 yards (my eotech). As the PS90 doesn't have tons of rail space, and I wanted a flashlight mounted - I did not have room for a flashlight, a red laser AND a green laser.
I ended up selling the green laser - someone WANTED it for outdoor, 100 yard use. And, he was aware of my cautions.
I really didn't think the thing was too safe. I did some research on lasers after I noted that it hurt my eyes to look at the beam on the wall. I didn't think it was worth the risk of owning it - as you could damage your eyes with a powerful laser w/o having someone shine it directly into your eye.
Now, as far as the price point - these cheaper lasers will probably not handle the recoil that more expensive ones can. Now, the PS90 kicks almost like a 22. But, I have seen neg reviews of these things when places on an Ar15 or something with more recoil than a PS90.
Also - U won't really know how powerful these things are - as they aren't necessarily marked with the proper wattage.