The issues I've had may be particular to my riding style and terrain, I ride faster than I should, mostly on paths and occasionally uphill, here are the list of things:
- Charger failed but Frey replaced it (air shipped a new unit free after providing proof), wouldn't charge to 100% and battery discharged inconsistently, glad it wasn't the battery
- Chain skipping resulted after a few months of riding fast on lowest cog, changed cassette and good for another few months but now slowly skipping due to high torque, I've had to adjust my riding style.
- KMC X10e Chain broke after 4,500 kms, changed that
- Schwalbe Moto-X are awesome no flats and still tread left
- Shifting is my biggest issue, had to change cable twice, doesn't shift well for me, looking at wireless solution
- I put 3M protection film on the bike and noticed paint chips easy on some parts (very thin coat)
- Changed the brake pads bled brake lines, adjusted brake levers
- Motor noise is a bit loud might need to regrease
- Guess you can always try to adjust the shocks with a shock pump.
Having said that so far, no real serious issues with the bike, just changed lots of components and added lots of extras.