Hey, it looks good in your signature, Bruce. IDK about that Sanwu RGB laser. I am getting close to finishing my controller for the LaserLand RGB laser for $44.00. I have two of them here and the divergence of them is at least as good, if not better, than the Sanwu. The controller is a lot of work to build, but the parts aren't that much. Three channels with +12 in and a regulated +9 source for the PWMs. It has three external pots that have control from 0 output to 100% output. Linear taper pots give it great control over the individual outputs. I'd say for ~$100 anyone can have this laser with the complete control I have gotten.
Once it is finished and mounted in a project box, I plan on doing a review of the laser and the controller.