Hi Rob,
When I'm on someone else's boat, or a charter boat - I've been on a few - they are never properly rigged or so dumbed down they are not suitable for racing. So many little things add up to unpleasantness: frozen sheaves, clutches that slip, undersized winches, blown out sails, stiff furlers, inappropriate sails, chafed lines, electrical system issues, engine issues, autopilot issues to name just a few that come to mind. Many things that are hard to find unless you're out using the boat. Count me out, unless your talking about a new, more standard IMOCA boat getting prepped for the Vendee.
But hey, good luck with it.