I just sent them an email
There service was great and all my issues were resolved in under 2 weeks that’s with me mailing it in.
To compare I had an issue the same time as my buddy had an issue with rotor, I had a new powermeter and rotor hadn’t made a decision on what was wrong with the rotor.
I would definitely recommend them. I have an Elsa and DZero with zero issues. The Elsa is 5-6 yrs old and I’ve only changed the battery on it, aside from the updates. The DZero a little over a year, no issues whatsoever.
In my experience, quarq has amazing customer service.
I’ve had my DZero on my road bike for nearly two years now. It works flawlessly. Easily one of my best gear purchases.