Default [Q] Updating cm 10.2.1to CM 11 m6?

Updating my wife's S4 from the last stable build of CM 10.
Was planning to do a clean install, but I remember upgrading my Nexus 7 and had issues updating apps through t-backup.

I know they merged builds for the S4, but was just curious if there there is anything I should be ready for when my wife gets mad for changing her phone.

I am a little out of practice because I bought her a new one S4, but that was after MDK. So she stole the S4 able to run CM.

Thanks in advance for your help