I have every colour of the Sanwu Pocket lasers and like them all. I like that the red laser and violet laser are single mode. I like the blue and green lasers too for the colour. I was using a 50mw 520nm pocket laser for astronomy, but I replaced it with the 5mw Laserland pen style 510 laser (see other thread). I also like that the violet laser causes fluorescence and it is really good burner too (focuses into small spot). I am a bit afraid of the blue and violet lasers for safety reason (high power and blue and violet bother my eyes after awhile). I have safety glasses, but accidents can happen.