In the long term, the results that end up being posted here will dictate which way I go with my P-06. I've spent a lot of time looking for info about the RMS and there is very little to be found. When I asked about it on FB, all I got was "buy an RMR". Not helpful at all and I almost shelved the idea all together as I don't want to ruin a gun that's out of production.
Earl,
I understand your concerns about getting locked into a specific mill cut on a special gun, for an optic you might not like or won't be serviceable long-term. That's why I've hesitated milling my SP-01, opting instead to use a 'temporary' set-up with Leupold CZ-75 mount and a JPoint.
Have you considered CZ Custom's mult-optic cut for CZ 75's? Basically, they offer optional plates for virtually every optic out there. This would give you long-term RDS options. But unfortunately not the ultra-low melt-in or conserving both your existing front and rear for BUIS that the Shield RMS (or RMSc) might offer.
I also understand your concerns that the Shield RMS might not be up to full-time duty, or even long-term EDC use. I think it's probably fine for HD or Sport/Competition use. Maybe it is fine for carry despite Aaron Cowan's harsh review but only time will tell. I wish the RMR hole pattern would allow low mount directly on a CZ-75 without an adapter plate, but maybe that's still your best option? Depends I guess on your intended use. YMMV and you make a good point. -Vinny