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. Likewise, when charging, the main battery gets charged first, then the range extender. I do like that I can connect via a second port on the extender and that connection will charge both batteries.
On a related note, the bike wasn't initially allowing me to use the whole battery (same with the range extender). It would get down to 10-15% and then skip to 0%. But that must have been because it was still new, because subsequent rides did allow me go all the way down to 0% with no skipping, while gradually throttling motor power starting at 10%.
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 27% battery left on the range extender. I upgraded to a brighter headlight so that probably has a small effect on the range. I figure that with my current setup, I can do about 25-30 miles before both batteries are fully depleted.
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. However the service manual says that I can change the stem and handlebar if I so desire.