I treated myself to one of these last week, but I'm not "getting it".
From the web materials, I expected it to produce one very small red dot, ie about 0.05mm ish. What I actually got when I switched it on was quite a large "splodge" which was made up of some laser sparkle and what appeared to be about five small red dots. Pointing at a matt black finish made the five dots pretty clear. I called the supplier to see if this was a colimation problem and they volunteered to check one from stock and send that out pdq, which they did. Just tried the "checked" one and it's the same as the first.
So not at all sure whats going on here, do I need new eyes?
Steve