as far as performance, it depends on what category you're talking about. Handling, the TSX will win, but only slightly, and if the TL has better tires the tables will be turned. Acceleration, the TSX is left in the dust by the base TL, much less the Type-S.
The interior is more luxurious and with more luxury comes more chances for something to break. I've found mine to be generally reliable. The most annoying problem has been the subwoofer. It's poorly designed and rattles slightly even after the dealer tried to fix it twice. There's a better fix than Acura offers - I just haven't gotten around to doing it yet.
I'm happy with mine and don't regret buying it at all, though if I had it to do again I'd get the Type-S. More fun, better brakes, and an even quieter interior thanks to the active noise canceling.