Only shot fifteen rounds...but instant gun lust. Absurdly easy to shoot...like a .22 (shot the 9mm). Muzzle-heavy + great sights + long sight radius, I think.
The P220 comes in an SAO version. No magwell or beefed-up dustcover. No 5.5" barrel, either, but the P220 is absurdly accurate to begin with. It's definitely a 220, though - oriented for the serious market (not to say the X-Five isn't serious, it's just aimed at the IPSC crowd, not combat/defensive use).
My only concern with the SAO SIGs is the positioning of the safety lever - it seems to interfere with proper manipulation of the slide stop. It's probably a "training issue" but it's definitely a different can of worms from the standard SIGs.
Edit: whee, thread necromancy.