For the ATC2 2008, the durability wasn't as bad as I thought. Having said that, I'm not really hard on my shoes... I don't go running down every ball, sliding into my shots... haha.
I only use them for practice and playing sets... nothing too serious. The tread pattern is slowly disappearing, but the traction is still there. Obvs won't be as durable as the current XDR outsoles. I pulled out the stock insoles and used some orthopedic insoles, which helps out my flat-feet.
I guess, if anything, they're a bit heavy.
Now that my ATC3 2015's have arrived, I'm ready to ditch the ATC2's and play in my ATC3 2007.