Unfortunately, I haven't tested it yet. It's the summer, so the SHO is basically parked until the late fall. But I plan to drive it for a trip in about a month.
Side note: My factory RS-A's (28k miles) are down to 5/32" tread and I'm hoping to keep enough tread on them to last 1 more Southeast Michigan winter before I fork out $1200+ for basic all-season tires. These 255/45R19s aren't anything special (size/specs) yet they cost an arm and a leg to replace.