We have a de-milled MB seat and MB does not want to be involved. Apparently the lawyers got involved. I spoke directly to them and said their liability was financial, mine was my butt.
We do have a HOT Stencil SIII seat, which is exactly what the Marines used. According to John Farley, the Stencil has a nasty habit of extreme neck loads in the flight regime of 180-225 knots, and that area should be avoided for ejection. I don't ever recall being briefed on that area and know a couple of buddies who died while ejecting in exactly that part of the flight envelope. That tid-bit of knowledge would have been helpful.
Anyway, we would of course like a brand-new, full-up ejection seat, instead of government surplus, but I'll take the chance. I'm not doing carrier ops, low-level nav, air-to-air, or being shot at.