We currently have a 1999 Accord EX V6 and are looking to buy another vehicle to compliment it. Having really liked the Accord I'm considering the Acura TL. Another option is the RL. I'm looking to buy used, so I have some questions regarding differences between the 99, 00, and 01 TLs.

Here are the Qs:
What year did they change the tailights from red and yellow to red and white? I really prefer the red and white, I feel it looks much better.

How is the stock sound system in the TL? I believe it's made by Bose. Does it come with a changer, how many speakers, is there a sub?

How's the tiptronic transmission?

How's the rear seat space? Comfortable, cramped?

What year did they change the grill and headlights? I believe it was the 02 model year.

Does anyone have the navigation system? Is it worth it?

Any general comments on the car would also be appreciated.