Yeah. Only difference is that it's already focused to infinity. Focusable lasers are mainly nice for burning things because you can focus the light down to a tiny point. If you just wanna point and have a highly visible beam it doesn't really matter.
Not necessarily. That green 300mw will still burn pretty decently. However it won't really compare to one of those cheapo $60 ebay 445nm lasers if burning is the goal. Green is the best wavelength for visibility, while 445nm tends to have the best $ to power ratio. If you want a highly visible laser and a moderate amount of burning power a 300mw green will work great. If you want a less visible laser with higher burning power go for a 445.
Wow I'm glad I know this now... Here I'm looking at lasers like why the heck is this 300mw green and this 2000mw blue the same price... Its all starting to come together now... Thanks so much for all the education! You guys are awesome and obviously know what you are talking about!
So Isaac do you build both? I know you said you could build a 5watt blue for me... But I think I want a better visable laser now that I'm finding out mines not as cool as I thought. Do you just do burning or what could you build for a "light up the moon laser"?