Much has been written about the Sony NWZ-E463 but one has not been mentioned. It has a function which calls itself bookmark. With this you can save the file just listening (in one of 5 "bookmark list"). If you call later as a "bookmark" to start playing immmer beginning of the file. So not at the point where you had the Bookmarked! When listening to long files such as audio books from a library-eLibrary, which are not divided into tracks at the time, an absurdity. I find the term "bookmark" therefore misleading!
Also there is no besondes fast forward. (Which could be used for example prolong Press) The normal flow is too slow in a very large file.
