Nope.
Do some web searching for how Best Buy uses their warranty to deliver "comparable technology" replacements. Which means if a low-end with a similar processor exists, they will give you a $600 cheapie Windows PC instead of a $1800 iMac or whatever.
YMMV and some stores have staff that do replace hardware with the same brand, but the micro-print does say "similar hardware". Not "similar brand". Or "comparable technology". It's a classic bait-and-switch.
The following is astoundingly bad:
http://forums.bestbuy.com/t5/Manufacturer-Warranties-and/Black-Tie-warranty-on-mac-pro/td-p/54293
Note the Best Buy employee's responses, trying to duck the issue by saying "I would venture to say". No way would I trust that at face value. The customer asked point blank for precise details and got an empty runaround, based on assumptions, in return. That is unacceptable.
Some BB stores would be ethical and exchange one Mac for another Mac, but others will definitely point out "comparable technology" and you'd get a $700 low-end Windows PC instead. You might want to check out your local area BBs and ask. Or get something definitive in writing to cover your back. Some people are unethical. It's unfortunate, but it's the world as we've allowed it to become.
Oh, the last Mac I bought - I listened to their bafflegab and asked them point blank about the fine print when they brought up the warranty.
Needless to say, I went to Apple and bought AppleCare instead. Apple I trust. Best Buy... You might get a Worst Purchase, in this regard. They do honor their warranties, but the Mac/PC issue - especially with identical processor technologies - is just a breeding ground for trouble. Someone there MIGHT try to take you for a ride and, again, I asked someone point blank at a store and got them to stammer. They are told to sell based on the allure. Get them on the fine print and they will not know what to do. Get a manager to write on paper "If the Mac fails, use the plan specifically for another Mac." You know that won't happen...
AppleCare I'd heartily recommend...
Lastly, re: BB:
(emphasis added)
Seconded.