Bought this a bit back, dont really use it much. It can scorch your hand if you point it, leave marks in black foam and you can see the beam clearly at night. Can be seen far away at night. It is rated at 50mw. Your common laser is normally 5mw or less.
If you are to buy this you must be incredibly careful with it. If it goes in your eyes it could instantly blind you. Only use this outside as dangerous IR radiation is also expelled and could silently blind you slowly if reflected off walls :S
Looking for trades, will consider anything!