Migration failed to work and came up with errors when I attempted to migrate from the SuperDuper dmg clone of the old MBP (after the clone failed to boot the new MBP). Tried many methods with the mounted dmg but they all failed. Probably would have worked if I still had the actual machine, I'm sure.
Unfortunately, because of the circumstances the old MBP was gone and my only option was the SuperDuper dmg. After everything else failed, because of the dire time constraints I did not have the time to reinstall hundreds of applications, etc. -- so, I did what I had to do and manual copied over the Applications folder (I hand picked those) and Library folders including items handpicked from Application Support, etc., etc.
I did all this for roughly 48 hours straight without sleep. But, even without a clone (that worked) or migration (that worked) - I was up and running and able to "save the day" for my client. How appreciated that was is another story.
It's been so many months I don't remember the specific migration errors I got, but I tried every workaround under the sun.
If I had had more time, I probably would have tried to clone it to another MPB that was a Dual Core 2 machine, then used that machine to migrate to my new MBP i7. But, once again.... didn't have that or any other luxuries during that time.