I found these PPAs earlier and was wondering what the differences were? The two PPAs are:
https://launchpad.net/~hrvojes/+archive/kde-backports
https://launchpad.net/~kubuntu-ppa/+archive/ppa
From the looks of it, I think kubuntu updates focuses more on updates to the underlying functions of KDE(if that makes since) where as KDE SC Master Builds looks to focus on providing updates to the common place KDE apps like amarok or kate. Is the KDE SC Master Builds generally stable?

Oh and sorry if this is the wrong place for it, wasn't sure what forum to place it in.

I've added description to the PPA:
"DO NOT USE THE PPA, THESE ARE CUSTOMIZED BUILDS PULLED FROM MASTER GIT!
IF YOU DON'T MIND BREAKING YOUR SYSTEM, GO AHEAD AND USE IT."

Kubuntu PPA is maintained by Kubuntu developers, and the first one by some random user, me

Thanks for the answer Sumski. I think all PPAs should have good descriptions, but thats just me.