Not just his finger -- it's broken at least one other shooter's finger. To be fair, though, that was with some crazy loads, even for a maximum: 450's @ 1625.
I've recently seen one 500 max shooter claiming 1500+ with 525's. Recoil aside, I think that's really pushing the limits of the gun considering Linebaugh, Taffin, and Seyfried pretty well all agree 1500-1550 is tops for 450's.
Personally, I kind of like the maxes. Not for the extra performance, but because they can do everything the 1.4" cases do at not much more than black powder pressures.
Lloyd's point about prices is very true with regard to Linebaugh-built guns. If you can talk Clements into building one, about the only extra expense is coming up with the Bisley parts.