I live in a high (6000' above sea level) and dry (humidity rarely goes above 30%, but usually is in the teens) climate and I recently switched to MRP paints as well due to similar issues with other paints. Both MRP and Tamiya airbrush really well in this environment...especially the MRP. MRP shoots straight from the bottle, and Tamiya shoots great when I thin it with 99% isopropyl alcohol. I have never used Mission Models paints, and at this point I have no reason to try them. The main thing I don't like about the Tamiya paint I have is that most of them tend to be pretty fragile and take 1 or 2 days for a full cure. MRP is rock hard in less than an hour. Tried their brushable type (with the F designation in the part number) for the first time last night and it too is amazing paint. Extremely fine silver pigment in their silver paint, so I was able to dry-brush it onto an F-16 boarding ladder without the "worn" areas being "sparkly"...they just looked like bare metal. The dry-brushing took a little while, and the drop of paint I put on the palette remained brushable the whole time without having to add retarders or anything like that.