I'm not in CA and have both a 9 and 40 XDM. I didn't bother to get a XDM45 due to the fact that one of the biggest advantages the M versions have is capacity. Since the M and regular XD have the same magazines. There isn't much of a reason for them. Unless you want the match grade upgrades.
Without the added capacity the upgrades are similar to buying car upgrades at the dealership. You can get better upgrades (barrel, trigger work) from the aftermarket.
Without the added capacity the upgrades are similar to buying car upgrades at the dealership. You can get better upgrades (barrel, trigger work) from the aftermarket.


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