I recently received the V3 of the 91 from MPT. Has the more aggressive throttle response, which I like. Still don't love the trans tuning. Almost like stock better. We'll see how it adapts.
I think the issue I run into with the trans tuning, is that they bumped the shift points up so high, that in the right conditions, the trans will drop down too far and grab a gear that's within 500rpm of redline, where there's no power. It'll hang there for a sec, feel flat to the driver, and then shift to the next gear.
As for ACC on my 17... I use it on my 150 mile drives two and from work, over 2 11k foot mountain passes, with no issue.