eh, I moved from a 8800 to 8310 this past w/end and used backup/restore AND the third-party backup detailed here> How do I backup my Third Party Applications on my BB? - BlackBerryFAQ
It is a little more complicated, but you have better control this way^^.
I have also moved several BBs from one to another using the Switch Device Wiz, and it worked fine also. However, starting with the 8320, a number of users noticed some old settings were being pulled over from the old BB to the 8320 which screwed up the WiFi UMA settings on the new device... so.
Another mod here advised the Switch Device Wizard could be TOO generic for some moves, and "could" move problems you were having with the old device. But I think it probably will do just fine for most.