I was quite surprised myself, Sam :)
I think there's a small problem with the installer script on the Raspberry Pi if you're running Pidora rather than Raspbian, but I've yet to confirm that for certain. Otherwise I was quite impressed that it managed 25fps.
I believe it might work even better with Qt5, but I haven't looked into that yet. A friend tells me that the Qt5 libraries integrate very closely with the Raspberry Pi video driver so it's on my list of things to do when time allows.
I'll download the new drivers and test them as I work on the next version.
James