Got my X55, I have ghosting but with the stick. The Castle Hat also hits the trigger and buttons 4, 5 and 6.
I've tried two computers, both are Intel with an ASRock motherboard. Tried USB 2 and 3. Reinstalled drivers, tried Win 7 and Win 8, tried unplugging every single USB and only leaving the stick on.
Funnily enough, the throttle works flawlessly.
I haven't tried with a powered USB Hub but I'm not keeping my hopes up. Right now the only solution I've found is to unmap the castle hat from games.
Saitek support has only responded with automated emails, useless.
Do you think the stick may actually be defective?