Since most of us using this site are enthusiastic hybrid owners, you will likely continue to read very positive replies. I add mine.
Several of the 2004 Prius 2-G owners now have over 25,000- 30,000 miles. Their posting on several discussion groups have indicated no major repairs, in fact mostly things like running over nails in tires, small rocks pitting front end etc--things any car owner could experience--nothing unique to the hybrid. Note though that the earlier 2004 models did have some TSB--technical service bulletins that usually invovled software changes primarily related to the fuel bladder/tank/gauge.
I think the best recommendation comes from the April 2005 'Consumer Reports' annual car issue. Out of over 1100 different vehicle models the tens of thousands of subscribers voted the Prius as the number one to buy again (94%).