I have a two year old X595 with the 62" mower with about 200 hours. I am impressed with the tractor.
Other than being a little ugly looking at it from the front I think the JD engineeers did a nice job. The only problems I've had is with the tilt steering mechanism when it locked into one position and I couldn't move it, the mower height control adjusting knob wouldn't hold the mower in position, and an eratic performing fuel guage. The tilt steering problem and the mower height adjustment problems were fixed under warranty. The eratic fuel guage problem still continues.
I complained about the noisy mower gearbox and John Deere provided the noise isolation kit. I trust this is included with all mower decks produced in the last year.
I wasn't sure how often I would use the 4 wheel drive feature but found I use it frequently. I have the heavy duty all purpose tires (gator tires) but they still slip especially if I'm mowing after the dew has formed. Just slip into 4 wheel drive and away you go.
This is good tractor. Now, if they just could have fired the team that designed the appearance from the front of the tractor this would be the perfect premium garden tractor.