I've been selling Home and Mobile Electronics for about 15 years. I have yet to go into a Best Buy or have a customer say that they were glad they went there.
The amount of expereince and knowledge is no where to be found, if you know what you want and the model, then yes go and buy it there, if you want some useful information to help you decide what's right for you, then your taking a very big chance.
the fact is BB can not and will not pay enough for highly qualified and knowledgable salespeople, usually people of that quality work as smaller mom and pop store where they can make that money or at least be appreciated until they move on.
dont fall for whole the hype, i have people who work at BB come into my store to purchase and have things installed because they dont trust the people there.
sorry but the BB thing gets under my skin