Don't get me wrong here, I like my KAC lowers, but as a right handed shooter, I don't use the Ambi features, and I shoot support side about 20% of the time. I also don't use the BAD lever anymore and have gone back to a more traditional set up.
I also have Noveske lowers and a couple others not currently being used, and I shoot them all the same. It would be interesting to see how many right handed KAC ambi lowers that actually train support side regularly, use the ambi features.