I have shopped for them before but never would again. I believe them to be unprofessional on a good day and unethical on a bad day.
I did get paid for work that I completed. My issue with them comes down to the fact that they requested I rent a car and bill it to one client (shop A) when using a taxi would have been the cheaper option for the client. They wanted me to rent a car because they wanted me to bundle the shop with another shop in the area for a totally different client where a car was required.
I was flying in to complete shop A. Apparently they couldn’t get this shop B scheduled with a local. Their “plan” to get shop B completed involved expensing a car to shop A, who was totally unrelated. Unethical.