Best feature for me was the pride of ownership, followed by the styling, and general feeling of solidity.
After that, it was the sound system, HID's, and gorgeous 17" rims.
Hated the TPS sensors ... on hot days on the hwy, that damn "pressure too high" msg would pop up on the DIC ... giving me the disconcerting feeling that the car would blow up at any moment.
Unlike some here, I found my 99 and 01 had a more refined level of quality ... the newer style was quieter, plusher ride in town, and had less wind noise. I never had a single drivetrain issue with 4 STS', but had tons of nuisance issues, mostly electrical.
I hope the balance works for you. On my 99, I tried two sets of rims and tires, lots of balancing, all to no avail. On my 2001, the shimmy occured with both my stock rims/tires, and my winter steelies and snows.
I switched from Pirelli PZeros to Michelins, drove 1 hour to find the closest Hunter machine, but nothing helped.
Finally, I went to my local GM dealer, and allowed them to put old fashioned weights on the outside of my rims. It didn't totally solve the shimmy issue, but effectively eliminated 90 percent of the problem.
I'm convinced that Logan has it down pat.
As this platform ages, there is a multitude of parts that become
prone to transmitting vibrations through the wheels into the cockpit.
The only sure fire cure are new factory rims/tires, which worked for Logan ... but who knows for how long.
I test drove both of my newer STS', noticed the vibration issues, had the seller's pay for balancing, and watched the vibration worsen as the tires accumulated a few more miles. I knew I should've run away after the test drives, but the cars were soooo nice, I figured I could solve the issue where others had failed.
Sorry for the rant ... I intend to buy another STS or ETC as a toy to go with my daily drivers .... a Maxima, an 08 Mazda 3, and the dreaded Lexus ES300, which I actually really like ... I know, its similar to your old Camry, but my two boring Lexus cars (LS400) never have any issues ... none.
If your shimmy doesn't go away, try the old fashioned outside weights. It definitely made my STS more driveable at highway speeds.