I have them delivered to my house, then take the tire off the bike and bring it to a dealer.
There you are, showing off that great big toolbox of yours again...
I have zero shame about showing up with tires I bought elsewhere at BMW Motorrad. They mark up their parts, they know that I know it, and might even have to order my tires anyway. If I'll do it with a belt, and I did it with the LED bulbs I had them install, why not tires? I think they ended up doing my latest ones for "free," because I had other stuff done at the same time.
I've read great reviews of Diablo's and wonder if the higher price improves the ride that much (I'm a slow and steady rider in no danger of scraping my center stand or sullying my chicken strips).
I do indeed drive like I stole it, but the majority of my mileage is back and forth from NYC to Virginia every week, so I could probably join you by low-rolling with Shinkos, Del, but I haven't screwed up the courage yet. Not a ton of sweepers on I-95, but when I do get to the country roads near the Blue Ridge, it's nice to feel confident enough to drag the feeler pegs when I want to.
I don't mind buying decent rubber, because my highway miles don't wear the tires as quickly as around-town riding will -- especially compared to NYC. Fewer potholes, less heat/cooling cycles on the rubber, as I tend to gravitate toward 100-120 mile ride portions between fill-ups of gas and coffee, versus the stop-and-go around town.
Basically, I like how the Pirelli tires communicate to me. I'm aware of bumps/road surface changes, but not overwhelmed, and they do it better than the Bridgestone and Metzler tires I've had on the same chassis -- again, for me. With no available adjustments in our forks/only preload for the rear, trusting my tires matters at speed.