I had a 1999 LS400 for about 8 years, and it was the best car I have ever owned. I traded it in this year (240,000 miles) for an 2004 LS430 because the A/C finally went kaput - everything else was still working just dandy - $1k trade-in. (I had spent $2k on A/C repairs and it still wouldn't work, so I gave up at the beginning of the Baton Rouge summer.) The LS430 is nicer, has more whistles and bells, and seems to drive better than the LS400 ... might be the tires, might be the lower mileage (34,000 miles). The new one has the NAV option, and I had the satellite radio retro-fitted. From what I've read on this site, the tires reportedly have a LOT to do with the quality of the ride; I do have the super-duper Michelin-X tires that are considered the best for this model vehicle. The only thing I don't like is the lack of the ability for physical key-entry to the vehicle. Entry only by the grace of batteries is a liability, in my opinion. One curious thing; the LS400 had LCD dash display and when wearing polarized sun glasses I could not read the display. I changed prescription sun glasses to non-polarized amber and everything was just dandy with the LS400 display. Now I have an LS430 and the display is amber LED and I can't see the dash display again! :-)