Random Shutdown MacBook - accept replacement or moneyback?

After 4 months of attempted and failed repairs on my young brother's MacBook, Apple has finally accepted defeat and agreed to replace his MacBook or give him his money back.
They assure us that the current crop of MacBook's (post-October) do not suffer from the random shutdown problem - but I cannot trust their word given how many times they have falsely assured us the problem had been fixed over the last few months.
My question to the Apple community is simple - do the recent crop of MacBooks still suffer from the Random Shutdown problem? Should my brother just get his money back and shop elsewhere?

This isn't much of a reply to the topic. I am new to Macs. My wife and I shelled out what is a good deal of money to us on two of the new mac books. We brought them with us to Thailand. Her computer has the random shut down thing. She loses work all the time. Safe to say she is not happy with my decision to make the switch to Apple. Sometimes she will be typing an e-mail or a word document and a half hour of work will just vanish. She has had to re-set her desktop settings two or three times as they keep resetting back to the origional factory settings.
My computer has a few problems of it's own. The hole in the case for the tracpad and button wasn't cut right so The whole cover needs t be replaced. This was diagnosed by a Genious at one of the Apple stores. I also seem to get electric shocks sometimes from the right side of the computer were my wrist rests when I type. My computer also freezes all the time. Just fozen like a PC with no way out (force quit won't work). The computer also opts to erase my computer and desk top settings from time to time.
The problem is we are stuck. We can't sent them out to America for repair or the government of Thailand will make us pay 1000 dollars each for import tax. You can carry them on your person, but they get heavily taxed when shipped.
I want to be happy with my investment but these computers were very expensive and they really shouldn't be breaking down all the time and freezing. In fact I suggested we get them because we didn't want computers that broke down and froze all the time. My wife is pretty unhappy with my decision here.
Joe

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    These instructions must be carried out as an administrator. If you have only one user account, you are the administrator.
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    Please triple-click anywhere in the line below on this page to select it:
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    Copy the selected text to the Clipboard by pressing the key combination command-C.
    Launch the built-in Terminal application in any of the following ways:
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    ☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
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