IMS issues are way overblown, failures are actually fairly rare, and permanently fixed by swapping out the bearing when you do the clutch, which is easy to do and doesn't cost much. Mine already had an LN Engineering retrofit kit when I got it, as do most of the used cars I've seen for sale.... but I've sometimes seen them with 200-300k miles on the original IMS as well.

My main issue with the early watercooled flat 6 Porsche engines is that they are just so complex and costly to rebuild. They will easily last several hundred thousand miles of hard use, but when they do need a rebuild, doing it properly can easily cost $10k just for materials to rebuild it yourself properly.