this has been posted about 30,000 times.
but i would like to say again that instead of buying specific things to power specific things.
you can just buy an inverter and plug a surge protector (fused to right below the max input of whatever power adaptor you're using) - that way no surges come through and if there is a bad one, the fuse will pop.
ive done this about 10 times with no problems with a MBP and no problems with MY UMB.
works nicely as you can charge your iPhone off the MacBook too 🙂