I've got just over 14,500 miles on my S8 and it's still going strong. I ride it almost every day although it's been a colder than normal winter so sometimes it sits for a few days.
A recent pic:
My front tire still has plenty of tread left but it's cupped and I can feel it in the handling so I'm going to replace it soon. I'll probably put a Michelin City Grip on it. Anyone tried one of these on their S8?
Here's a recent, short ride report I did on my S8:
http://bamarides.com/ride/ride-reports/ride-for-the-cure-riding-to-cure-pms-and-sids/