I have used the PS2 runflats before and I imagine these will affect the PSS in the same way that run flat technology impacted the PS2.
I.e. this is what you should expect:
1) less stability over expansion joints and bumps. I.e. be careful when taking a high speed ramp. Because the tire flexes less, your contact patch will be adversely affected in these situations relative to a standard PSS.
2) less traction in the rain for same reason as above
3) less body roll and firmer ride
4) reduced ride quality (and in some cases you may hear rattles as a result of the reduced ride quality because it will transmit more vibration to the cabin).
Oh and as a previous PS2 ZP owner, I will never buy a Michelin run flat again - I got rid of them with 6/32 remaining and switched back to regular PS2s back in 2009.
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