I purchased my 3M sun gun color matching light about three weeks ago. I want to say that I love it!! It's already saved me a couple of times with just color matching. I use PPG's color variant deck and the sun gun helps me choose the correct color variant. I also use it in the booth between coats of base to check for color coverage. That saved my butt the very first time I used it because I thought I had the base covered but I put the light on it and was able to clearly see that it wasn't. I find that my 3m sun gun is as much of an asset as my spraygun.