I loved my X55 until a few days ago. I am not going to bash it but it could have been built better internally on the throttle. The wiring the review on the Amazon page by dudesofrugal that comes down from the throttle is real vulnerable to shorting from consistent throttle movement. Mine has suffered such shorts and has rendered some of the buttons inoperable, more may go with time (this is not the "ghosting" issue). I am working with their support right now, so if my outcome is favorable or not I will update this post. This is a video someone has made of the issue here.
It is a good flight system with the exception of this issue and I don't have any complaints otherwise. Worst case scenario for me, I will have to go in and replace the wiring setup myself and make it less vulnerable to shorting from movement. I am hoping the manufacturer will be helpful with replacement. FYI, the issue came after 5 months of moderate usage.
Buy it on Amazon and use freight forwarder