I have a 650, n63tu. I don't really notice any turbo lag. the power feels pretty linear and you cant even really feel the boost kicking in. the throttle doesn't really feel on/off to me either. I drive the car 75% of the time in sport mode. in terms of reliability, i have 10k miles on mine and nothings broken yet. the only thing i don't like about the engine is that there is a lack of power from around 6-7k rpm. the car feels like it falls flat on its face and struggles to hit redline. the 4.0 twin turbo V8 in my previous audi s6 felt like it was a faster car.
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