I think the Pilot Sport A/S is a great tire, but it's hard for me to say how great because it's the only car tire I've had on a motorcycle. There's been absolutely no concerns other than what I've said out in the forums.
Remains to be seen how the the tread life will go. Right now I have a little over 2,000 miles on the tire and based on tread depth I've used somewhere around 15% of the legal tread. So, at this point estimating 10,000 miles or a little more. While estimate isn't as much as I was hoping for, it's still a much better deal than the motorcycle tire. At least, twice the tread life and 2/3 the cost.