I have been lurking here following this thread for the last year. Received my NWZ-ZX1 via Sony Canada last Monday. It was pre-ordered the day pre-orders came live. I loaded it up with 70GB of assorted files ranging from 256 kpbs AAC to 2,8 Mhz DSD, did all the updates, and got off to a great start. Biggest bang for the buck of any portable I have owned over too many years to count.
Sorry to read about your touch screen issues but it is fortunate Sony brought in enough to send you a replacement. Monday, after I received mine, they updated the status to backordered for several hours. Now they have stock again.
The player is outstanding with Sony MDR-1RNC headphones. Not up to expectation using XBA-H3 IEMs but when paired with the PHA-2 it is superb. The first several days point to a battery life way below claims. Six hours with the PHA-2 in use..
Good luck with your replacement.