Hello to anyone still reading, I apologize for no posts since October but I have been rather busy with classes. I was planning on posting my review of the NWZ-E575 which I purchased last December to replace my X-Series.
In short, yet the headphones from the new E work on my X, yes they are better than the headphones that came with the X and the E series is a nice surprise. I've been using it as my main Walkman since I bought it. So stay tuned for the full review, hopefully in February when I will have free time.