I ran an ultralight blitz gsf at dozens of race days in 17.5 blinky and it was still in better condition than a lw pf ms6 body with half as many runs. The ultralights actually last quite well in the slower 17.5 classes. In modified, they do indeed deform at higher speeds if you don't brace them with a 5th body post and foam between the bumper and the area of the body behind the splitter. Those items partially negate the weight savings of the ultralight body. I had better luck with the lw body in modified touring.
Anyways, the M410 looks fantastic, and i can't wait to try one.