Does it matter that my McClellanville agent's office is in Meggett, or that their brokerage is not a name I recognize from the Island?

An agent's office location matters less than whether they actually work McClellanville regularly and know its specific rural details, like well, septic, and flood zone questions that don't come up the same way in a typical suburban sale. Brokerage name recognition also matters less than the individual agent's track record, since the person handling your file is who negotiates on your behalf either way. Brian Beatty works both McClellanville and Meggett directly, regardless of which town his office sits in.