3 /5 Dalton Deford: I want to preface by saying that everyone I spoke with was helpful and seemed to be genuine.
That being said, the prices I was quoted and charged from this garage were very high. I brought my 2018 Audi e-tron for a 40k service and maintenance and was eventually quoted ~$2,700 total. The "service" was about ~$750 and the remaining ~$1,950 for maintenance like spark plugs, transmission fluid, brake fluid, etc. I felt the price was too high but ended up paying for the service as it had already been done, I decided to get a second opinion from another garage for the other maintenance.
In the end, a Petaluma garage charged me $1,200 for the remaining repairs, bringing my total paid to $1,900. They were also shocked at the $750 I had been charged for the "service" here. Long story short, if I had gone to the Petaluma garage to start with I think I would have saved at least ~$800.
I was convinced to go here by how many reviews mention the prices being very reasonable, or even cheap, which I find a little odd. I would recommend getting a second opinion if you feel like it seems high, maybe Marin is just more expensive.