As of SS 4.2, there are new versions of these tools - so if you plan on migrating/trying SS4.2 and need to wipe, go to this link and download/install the bkapps.zip file:
Once installed and rebooted, run bkapps -c for a COMPLETE backup, including accounts, etc.
Wipe, flash 4.2. Run rstapps -c once phone is booted up. Reboot. You are done, the only thing that should be missing is the homescreen widgets.
Also NEW - bkapps/rstapps are 'apps2sd' aware - which means if you have some apps installed to SD when you run bkapps, it will remember - when you restore via rstapps, it will restore those same apps to SD