NEVER. I wouldn't trust Best Buy to give me info on an item on the shelf without looking it up myself. I don't know of ANYONE who didn't get ripped off or wrong info from their "Geek Squad". I would sell something as is on Ebay and buy a new one before having Best Buy handle a repair. I would, however, buy a new Apple product from BestBuy if they were local and I didn't want to wait.
I was asked to leave the local Worst Try store after correcting a statement by a salesbot. It was a blatant misstatement and I easily demonstrated the error in that statement, and as I was walking away was confronted by 'a manager' that asked what I was doing, and then after my brief explanation, was told that I should leave. That they
didn't like people correcting their salesbots, and embarrassing them in front of customers'. I was about to protest, but realized I was being quickly outnumbered. I left. The customer did too.
On edit: Oh, yes, it was Mac related...