In spite of my tentative hopes, earlier in this thread:
http://www.head-fi.org/t/687944/999-calyx-m-with-dxd-dsd-64gb-single-sd-storage/285#post_10117536
...what bugs me most about the Calyx-M isn't the capacity or the battery life, but the fact that there really don't appear to be any [ FFW ] or [ REW ] buttons on the unit, which, IMO, is a stupidly unnecessary omission, possibly to reduce development time of the firmware, but substantially crippling the user-friendliness of the device, for people who do not wish to lift their expensive DAP out of their pocket every time they wish to select a different track. This is not just inconvenient, it's downright hazardous to personal safety / possessions security in places like central London, Barcelona, NYC, etc, where muggers or pick-pockets are common.
Sony and Cowon understand this, and iBasso have addressed the DX100s omissions in the DX50/DX90.