Being a laserglow product, if they say it is 5mW, it WILL be 5mW of green light. It also has IR filtering, better lenses and APC (Auto power control) so it will have a stable output.
If you want cheap, go ahead and buy the $5 ebay pens which put out more IR than 532nm light and the output brightness fluctuates even if you just cross your eyes or look at it funny.
note: I'm not affiliated with Laserglow. Just putting all the info on the table for the OP to make a better decision for what is his intended use (which he did not mention)
Cool, looks like a decent laser, 2 more things, is it durable and can you see the beam at night?(I would be willing to pay $59 if its gonna last me a long time)
Glad you like it! We know that our 5 mW pointers are more expensive than some, but we also know that our pointers are of the best possible quality and we totally stand behind our products. We appreciate your positive review!