Maintenance Valet Service

We already know the importance of car maintenance and its benefits to our car. However, the big hindrance most of us experience is our availability. I've read several articles which introduce a maintenance valet service in different countries. There's a similar service offered in my area which I find very useful. I once booked a service when I had scheduled maintenance during the workday. Through this, I was able to have my car maintained while I'm in the office.
Did anyone book a similar service? Do you find it useful and how was your experience? It would be great if you could share your thoughts.