In most areas except for midi, it is as good if not better than 5.1
But if your heavily MIDI dependant, you may want to check out the free demo and make sure it is going to fufill your needs. The midi department is a bit behind 5.1 but they say it will eventually exceed it but that may be with paid upgrades.
Unlimited Undo is very nice and once your used to it, it's hard to live without