I believe not many units have been sold. HFM can either remain as failed TOTL dap vendors or turn things around by releasing R2RK version 2.
Like you said bigger battery and definitely a physical skip button plus better amp. I wouldn't mind up to 30% weight increase. HFN doesn't seem to have
a good software skill to back up their hardware but then I don't expect too much. Keep the basic function but make it stable..Not really sure if they will continue
upgrading the firmware for R2R2K as I am seeing no activity.