I was sent Kevin York's direction by a friend of mine, and relatively long-time Car Tender customer. To borrow from one of Andy's early posts, I don't love them...I like them. Don't get me wrong, they're friendly guys and quite knowledgeable, but maybe it's the experience of trying to maintain a classic Rover that has me a bit jaded on all garages.
While things can get a bit expensive, they do go the extra mile with shuttles to nearly anywhere within reason, a freshly-washed vehicle when it's ready for pickup, and they're always hunting for constructive feedback. The key for me was their knack for explaining, in non-technical language, precisely what the issues are with your vehicle...honestly, almost as if it were their own car. To that end, they've actually steered me away from what would have appeared to be costly repairs on several occasions, or suggested reasonable alternatives.
Bottom line, I wouldn't use them for a basic oil change if you don't have to. But for anything more serious, give them a shot.