Yikes... Another 6AT vs 6MT thread. Oh well, i'll play
The AT is a joy to live with. It's much better at gear management than most of the manual stick-shift drivers I know (including myself). It shifts very fast and allows the engine to stay in it's power band longer... It almost feels like a CVT sometimes. This is for a DD.
At the track where you're always in higher rpms you'll get more out of the manual. I've driven both MT and AT. The AT will probably get you 85% there so for the novice wknd track guy it's a stress free "cruise" around the track which often times = FUN. If you're good enough to drive the car 10/10ths the 6AT will probably be holding you back. I have no problem drifting my 6AT at the track.
With that said... the 6AT at the track is awesome when you realized it never messes up a shift - it holds a gear when you want it to - it predicts and rev matches downshifts better etc... this is until your skills as a driver out grow it. Then perhaps you should buy a more serious track car anyway. The 6AT could use a shorter final drive if someone wants to get the most out of it on the track. It's fine for me as a DD.
There's one annoyance I have with the 6AT... when you're sitting in the slow lane (not in Sport mode) and you mash on the gas pedal because you want to squeeze in front of a faster car in the lane over... it takes it's good old time to downshift. I've since learned I need to downshift with the paddles to lock in the low gear prior to mashing on the pedal. It's easy just needed to retrain my brain how to drive it.
$0.02.