Well this is a suprise.. It seems stable for me, I've been running latest mostly stable KDE 4.2 , I've noticed on and off again hangups and slow downs on my system using KDE.
But this latest pagestream runs very smoothly on my system..

there are a couple of niggling things that need to be changed to make it really shine.. will send a list of these later, as it is late and i've been having fun trying the latest version making some signs to promo products for the upcoming holiday.