We've had our NX4510HST cab for two months. Very happy with it. I'll add a few thoughts to what's been mentioned thus far. Our dealer added the two rear remotes for just $150 each. Also added the rear windshield wiper for the same, as I recall without looking at the invoice. Having the stereo as an option was actually a plus for me. The factory radio was around $300, and came with a CD player, which was of no use to me now that MP3 eliminates the need for disks, and MP3 won't skip in the bumps. I also wanted NOAA weather band capability, which the stock unit doesn't have. For $45 I added a Pyle AM/FM stereo with VHF weather band and a USB port. Only needed to clip off the NX's factory female plug, trace the wires, and hook up the Pyle harness with wire nuts. The factory antenna wasn't sufficient for good reception of the VHF signal in our area. That was easy to remedy by unscrewing the stalk and replacing it with a DIY antenna for a few bucks.
I'll add another thing that hasn't been mentioned. Yes, the relocation of the fuel tank and fill spout to below the frame makes filling much easier than on the DK series (Kubota has done the same for its Grand L 60 series, and probably other models), BUT there is a loss of ground clearance. Not from the protective skid pan, but from a strut below the tank that appears to have been added to prevent high-centering on the tank. This may be an important fact for some folks.