If every Mac reseller were as awesome as MacMedia, Apple would never have had to enter the retail game themselves. I don't care what your platform preference is--these guys are the epitome of the independent computer store.
The sales staff are friendly, no-pressure, and know their products inside and out. And they can walk you through a great variety of merchandise in-store for just about anything you'd want.
The repair staff are equally great, and as members of a dying breed, can actually test and think instead of brainlessly following a flowchart. Even better yet, your diagnostic fees are applied to your repair costs--so unless you opt out of a repair, diagnosis is free.
If you're looking for a Mac or need yours fixed and don't want to swim upstream through the spawning hipster-salmon at an Apple Store, MacMedia is the place to go.