My 2001 Prius, one of the original ones, hit 100,000 miles yesterday and is still going strong. I am very happy with it and my overall experiences have been excellent. Toyota has done much to keep me a satisfied customer, such as replace the main battery at no charge (pun intended) when it went out well after all warranties had expired.
I am trying to decide whether to try to get 250,000 or more miles on it. I really think I could do that and more. Plus it will eventually be a historical vehicle as the first viable production hybrid.