The main advantage of this, as most of you know, that you will get updates with the rest of system automatically.
PPA is currently containing development snapshot of QupZilla, but don't worry to install it, there is a lot of new stuff totally worth it :-)
After next release (1.1.0), I will make 2 separate packages, qupzilla (stable) and qupzilla-next (development snapshots).
You can add PPA and install QupZilla with these commands:
sudo add-apt-repository ppa:nowrep/qupzilla
sudo apt-get update
sudo apt-get install qupzillaLaunchpad site here