Actually…, the autotune function is just fine. You just have to configure it properly… Boostjunkie, the moderator of msefi, only uses autotune, not the other alternative, which would be logging with megalog, and then using the software in megalog viewer to tune your map.
Autotune will only affect certain aspects of your car though. You still have to tune timing, cold start, idle, etc… by hand.
When I did it, I used autotune to perfect my out of boost VE, then I used megalog viewer and TONS of logging to tune my in boost VE.
–mark