it has been reported that with the new 137gig plus hard drives patch it disables some files in evo-x from running.
also it has also been reported that Evo-x has had mempry leaks on your xbox.
i got the sources for evox and they are not nice to work with .
the cgo script in evo-x can corrupt your xdk xbox files if you use it wrong.
M-X-M on the other hand is different. sure its a bit harder to use and its not for noobs but it has a steady ftp server (unlike evoxs especially in the latest release) and is allot better.
personally myself use M-X-M but i use avalaunch as my main secondary dash (that kicks ass too)
the jist of this is DONT USE EVO-X!