Been using it since 2004.
I've had multiple profiles lost, and have been using four profiles concurrently (using different firefox profiles) so I can stumble 500 topics rather than 127.
Never really used i like it/no more like this, though, so it hasn't learned me.
I use winsplit for perfectly aligned windows, plus virtuawin for virtual desktops on 2 big monitors, each monitor with 2 browser windows open with different stumble topics chosen = efficient overload of information to waste time.
Topics left to right in pic (what I'm currently stumbling):
American History, Ancient History, Medieval History, All.
(What I was stumbling, but had to change to fit rules if I was going to take an example pic: Liberties/Rights, Law, Politics, All.)
http://imgur.com/DUtlql.jpg
http://imgur.com/DUtlq.jpg
That's how I stumble.