Finally got to go for a little ride this morning and I`m not convinced that it makes more power, but the claims about it making the motor smoother are definitely true. I recently put on a new rear motor mount and the vibrations were brutal. They are still there, but so reduced that the difference is amazing. We`ll see if it stays like that after the ECU learns about the change.
I don`t see this last as reasonable, because the ECU should have this set to a particular value, but my idle speed is noticeably lower also. Unless of course the idle was so rough that it wouldn`t run properly at the target.
Edit: I was just looking at the torque steer thread and realized that maybe the car is a little stronger down low after all. I stepped on the gas at one point and felt the wheel tug, which I no longer notice, normally.