Gene,
I just called Echotrade and confirmed, their QQQ orders go to the Amex (they also let you preference ISLD or NYSE if you want), and they have never been hit with cancel charges. According to the guy I spoke with, they have some traders that do a big volume in the QQQ's and have never been charged a cancel fee by Susquhanna. They have heard of it, but also say the only traders they have heard of getting charged are traders that go through SLK.
I guess the best answer is, are there other traders here who do not go through SLK that do get hit with the cancel charge?
def - does IB get hit with the cancel charge?
For quite some time I have heard that it was a selective thing by Susquhanna, if this is true and you trade the QQQ's, talk to a firm that doesn't clear SLK and you may save a ton.
-Jim