My experience with various esters is about what Brad's is. Polyolesters and diesters bring something to the table but aren't the end-all, be all. We explored every aspect of lube, including the solventy, self-cleaning esters, lubes that didn't melt at all, and lubes containing no wax, and about a zillion other individual ingredients and blends and found repeatedly that lubricity is an easy quality to get and wasn't the challenge to making a good lube. Even plain Vaseline provides plenty of lubrication for speeds into the 2k fps arena. Brad's last sentence above sums it up.