Congrats on yours and getting it issue-free (- probably Fedex?) It is a great bike - or will be.
Got mine on Friday - after weeks of it being lost at UPS. I bought direct from Wallke's website. They are responsive.. but dealing with some issues - lots of damage (cadence/pedal sensor cracked, front fork seems bent/brake alignment/grinding, derailuer guard was crushed in shipping-they told me to bend it back! lol -, scratches from seat post/and front axle bolt not installed during shipping - so it was bouncing the bike around); came with some fun little goodies (alan wrench set and socket wrench (careful it will strip), rechargeable brake light. The wheel rim holes are interesting to lighten the wheel weight - but they expose the actual inner tube.
This version of the X3 Pro they cheaped out with Shimano-"Tourney" derailuer and not the Shimano Altus as advertised and it randomly shifts on its own - need to adjust it - probably because of the guard was smashed into it.
I'm not convinced its a 750W motor - it clearly marked 48V50026 (which to me means 48 volts, 500wats 26"). - If they are running higher voltage say 52V then, yeah you'll get 750W. Sent them an email and awaiting reply. I was able to take a ride with just the throttle, so not sure how its really working.
Its odd that brake regen only engages at above 14mph, and only in PAS 0 or 1 - seems it would make more sense to have it engage when you hit the brakes.
Mods - seat is useless, so getting new seat, and a rack (probably end up with seat post mounted; fender kit; and maybe alarm (living in SF...)