What experience has been made upgrading LibO from "launchpad"?

I am newbie in Linux and consider to upgrade a Linux Mint 17.1 LTS machine as well as a kubuntu 14.10 machine using LibreOffice Packaging in Launchpad
Both distribution are based on Ubuntu.

What kind of experience was made in such a constellation?

What experience has been made with other upgrade methods outside the normal Ubuntu upgrade cycle?

From https://launchpad.net/~libreoffice/+archive/ubuntu/ppa updates are pretty fast and always worked so far. I always add that PPA on Ubuntu-based installation. Ubuntu repos tend to be slow to get an update, and they’re always older, likely based on the Still branch.

Thanks for comments based on your experience! Very helpful.