Hi,
I am already a member of the 1st Gen Tundra forum. Just had to chime in.
I purchased a used 2004 Prius Package #9. I bought a used one in order to get the coveted HOV (Carpool lane stickers). Now I can drive in the Carpool lane until 2010.
So far the 04 Prius has been good to us. It had 42K on it when we got it in late May of 07 and so far has close to 60K today. Extended warranty is good for 100K. So far so good; one oil change since then.
What I like:
Filling up at the pump
Driving in the carpool lane
Ease of maintenance. (Not only is filling up at the pump less, the price of changing your own oil is less. 3.3 quarts of synthetic oil every 5000-7500 miles, plus OEM filter, and washer.)
Roomy interior
Hatchback and fold down seats
What I don't like:
That environmentally friendly paint. It is just like the Tundra paint on the hood; very thin.
For the 04-05 Prius, the burgundy painted interior dash and upper door panels;

However, some people think it's very modern and cool; disagree

.
Would I get another one:
YES, but I may wait for the next generation, I heard it's gonna be a redesign and may come out as a 2010 model. So you'll see it in 09.