There is a whole thread on this subject. But yes in the minds of the team that quickly put together the flash to address the severe hesitation/stumbling issues it is supposed to be better. After buying my car new unflashed and experiencing the issues I wanted to drive it through the dealership window. Had to wait 5 months to get it flashed. Sure the driveability was noticeably better however it was not a 100% fix. You need a standalone and tuning for that. If your MSP is unflashed a certified Mazdaspeed dealer will charge you most likely whatever the shop fee is for 1 hour, that is about how long it takes.
