Have I visited a Magnolia store located within a Best Buy store? Yes. Would I buy anything from there? No.
I have plenty of local dealers that have been working in audio for longer than the Magnolia employees have been employed by BB. The local audio shops have done a much better job to impress me with their gear when I've visited them. Magnolia, on the other hand, is just a "cookie cutter" operation dreamed up by the folks at Best Buy. Additionally, from what I've read, the "true" Magnolia stores - or, rather the original Magnolia stores are truly a place to see and shop at.