I have a 2012 Audi A6 3.0 (C7)

i am thinking of getting the APR stage 1 and stage 2 tune done. has anyone out there had this tune done to the same car ?

what kind of horsepower and torque number would i see after this tune?
what kind of 0-60mph times should i be seeing?

is it worth it, is there any disadvantage to this tune?

i have been quoted $2300 for the complete stage 1 and 2 tune, does that sound about right?, i am located in los angeles.