Used about 10% in a lager grist with a significant percentage of flaked corn. This provides more conversion power than ordinary two-row. The result was a wort that still exceeded the predicted original gravity and also fermented to the predicted terminal gravity.
I used this at about 10% of my grain bill in an IPA for the first time. Didn't have any expectations but was surprised to find I have a significant chill haze in my beer. I have made the same recipe a number of times without the 6 row malt and it's always clear. Also seemed a touch more malty, more of a pale ale than an IPA. Still quite drinkable! Buy some and experiment!