Usually when I backup HDs I'm backing up the entire thing, all partitions included. When you restore it, it actually restores the partitions too. That means if you use a drive with another size that you'll have some free space that isn't partitioned and you have to run some trickery on it to get it back.
With the Disk Copy/ASR method though I'm guessing by what's posted here that you can restore an install to any size drive and your partition sizes aren't touched. Right? That's a LOT more convenient than having to fool with partitions.
I'll be testing this soon and I'll report my findings.