They do shoot very well, and at pistol range the point of aim is the same. I can shoot as many as I want and the barrel is still as shiny as new inside. But for some reason (yet undetermined), they shoot just a little slower than conventional lubed bullets. My .45 Colt shoots an almost unnoticeable 4-6 fps slower with a 274 grain bullet going 750± fps, while my .357 bullets at 160gr shoot about 44 fps slower when fired in the 1300± fps range. This does not bother me, but some of the rifle shooters are worried that it might affect long range with light bullets. I have not chronied anything in my .30-30 yet, so I cannot tell you much about rifle bullets.
I do have a mold on the way for my .270 though, so I should be able to do a good comparison with some higher velocities later this Spring.
Recovered pistol bullets show them behaving just as uncoated bullets with normal expansion and no effect on hollow points, but I would not expect a 1/1000" polyester coat to
really contain an expanding lead bullet appreciably. It is just there for friction protection during the ride down the tube.
I'll have to dig some of them out of the berm and take a few pics.
I have not photographed any mashed up ones, as they look just like regular ones, only they are green, red and blue.
I would imagine that Rangefinder has done much more impact studies on his than I have.