im 21 years old and can drive manual VERY well. I could heel-toe like a champion in my single turbo 350z when I had it. Since i've had the 370z I think I took SRM off once just to figure out how the button works. Not gonna lie, after reading this thread I turned SRM off just to see if I could still heel-toe and wow was I surprised. I'm EXTREMELY rusty, and thats an understatement. Not only did my heel-toe technique suffer, but my upshifts and my downshifts were sloppy as well. It took me a few minutes of driving before I was able to properly rev match a downshift. Needless to say, we are totally spoiled with synchro rev match. Good thing my next car will be a GTR and I wont have to worry about brushing up on my skills