Don is the man! This is my third experience with him, and it's rare that you meet a mechanic (or any business owner for that matter) who conducts good, honest business. I dropped off my Z for an unknown idling issue, and while Don had it for two days to try to diagnose the problem, he wasn't able to reproduce the issue that I described. When I came to pick up my Z, he didn't charge me at all since he couldn't reproduce/diagnose the issue. Typically, most other shops would at least charge an hour or two to investigate the issue, but not Don. My Z is fine now, but if it does act up, I'm coming back to Don without hesitation!