Very cool laser, easy to use. Power not sufficient to burn paper though, can only engrave dark surfaces.
Hard to find good documentation about the circuit.
Very small. Well packaged. Very fast shipping. Good beam profile. For the price it is a truly excellent buy. My intended use is for a interferometer used in testing near IR optics. The near IR optics pass band extends down to about 600nm so I can test visually not needing an IR camera. I am very pleased with the Laserland store and will be looking for there for other laser products.