my experience: i bought the X1 v2 and tested it out. i upgraded the firmware to 1.6 and set to gapless, but still noticed gaps. i wasn't impressed with the sound quality of the unit through headphones. i messed with the EQ but couldn't find any setting that worked for me. i also thought the bluetooth connection was iffy. i would have the unit in my pocket and i'd hear dropoputs repeatedly.
after all this, i decided to return the unit. i much prefer the quality of my Cowon iAudio 7. i have used it almost daily for the last 10 years, the sound is fantastic, and the battery life is still great.