I’ve had my X55 for just under a week now. My first impressions are positive. The convenience of the added switches on the throttle base and the numerous hat switches are a vast improvement over the X52. The throttle itself is very difficult to move at first even at the setting of least tension, but once it is moving it remains loose for a little bit. I hope this isn’t an issue in the future as I use it more. I have it connected to a powered USB port, so no ghosting issues to report. I have had zero difficulty creating my own key profile in BMS. I use the largest spring and find that it suits me perfectly - the smaller springs give the feeling of too much sensitivity.
The overall construction is impressive - it feels solid, though a bit on the lighter side. Not an issue in my case as I am bolting them into my pit shortly. One thing I did notice - if you use the rotaries on the throttle, ensure that they are at the zero position before loading the game to prevent issues in 4.32.
I have not tried the X65, and though I looked frequently for one, I was unable to find any. I do not feel at all that I’ve settled for the X55; I am pleased overall with it and it is a huge step up from the X52 for a very reasonable price.