I'm coming up to the 1000km mark with my cruzbike quest recumbent, and no issues to report.
The drive does make a quiet whirl when I'm riding with no power, but there's no added resistance to my pedaling, or the roll of the bike. I've picked up a month ago that I should stop pedaling and coast for a second, between the 'virtual cog' shifts of the SRAM dual drive. Makes for silent/no mechancial strain shifting [slaps own forehead].
No issues with calibration that I'm aware of. Either have feet off the pedals when powering up, or slow reversing action if I power on while moving, both actions seem to avoid the issues other users have reported. Haven't waited more than 2,3 seconds between powering on and applying power to the pedals.
Still leaving the bike power at level 2, and boost it to 3 or 4 when climbing a big hill. After 22km (travel time around 40min, average speed around 40km p/hr), the 48v 10A battery recharges in under and hour.
Still very happy with the drive [but touches wood as he tempts fate].
A couple of fresh pics: I've moved the battery to the front boom, as the new rear rack and seat brackets no longer accommodate it behind the seat. On the plus side, no more danger of my head catching on fire if the battery played up.
Sorry for the upside down images. MS Windows can't make up it's mind how to display embedded previews. Sheesh.