That's what I do on my MacBook Pro. It was much more palatable than discarding years of typing experience.

I don't dispute that it works. But it does rather detract from, well, the aesthetic elegance of the machine. Apple has these fancy backlit keyboards--it's a great shame to make the keycaps wrong.

Plus, it also causes big problems when I let others use my machine. Hunt-and-peckers don't stand a chance when your keys are mismatched. Though they probably struggle even with the regular Apple layout--good luck finding # on the keyboard, since Apple doesn't deign to print it. Sure, once you know it's option-3 it's not so bad, but I don't know how you're meant to just figure that out for yourself.

And the thing is, it's all just gratuitous. Apple's layout isn't in any meaningful sense better. It's just... different.