I took delivery of mine a little less than a month ago. I really love this bike! I opted to get mine with the range extender. The TQ motor is very quiet. In the rare instance that I can hear it, it still leaves me thinking that I'm mistaking it for some other noise in the background.
One of the first things I had to change after a few rides was the tires. It comes with the Bontrager H2 Hard Case Lite, which aren't bad but they are heavy and slow. I could feel the difference compared to my Specialized Turbo Vado SL which is outfitted with Schwalbe Marathon Supreme tires. I installed the Continental Contact Urban in the same size (700 x 40), and rode 40 miles this past weekend. Very clear difference, and I confirmed that with the numbers measured on my bike computer. This set made me love riding this bike even more.
One thing I don't like is that there isn't an option to use both batteries in parallel. It uses to the range extender first and then the main battery, so I usually just keep the extender in my pannier until I need it.
On a related note, the bike doesn't seem to throttle down the power when the main battery gets low. It just cuts out the motor power at 15% and skips to 0% on the display. The rest of the bike is still powered. If I'm running on the range extender, it does throttle power down at 5% I think, and then I lose all power at 0% for a couple of seconds while it switches to the main battery. There's a glitch that occurs every once in a while during the switch where the whole bike will reboot, and I have to set my desired assist level again. There is no option to have a certain assist level set at startup.
I hope that with future updates, I can run both batteries together and hopefully get more range. I was able to do 20 miles on the highest assist level and had about 5-10% battery left on the range extender. I upgraded to a brighter headlight so that probably has a small effect on the range.
Another small thing I've noticed is when I'm switching gears. I ease on the pedalling pressure when I'm shifting, but about 10% of the time, the cadence sensor reacts a bit too quickly to the reduction in pressure and stops the motor. I would've liked maybe an extra second of delay between when it thinks I've stopped pedalling and when it stops the motor. This is how my Vado SL works.
Finally: I'm not the hugest fan of the handlebar. I would've preferred a straight/flat handlebar. It doesn't bother me that much though.