I think it was Fred that recommended Sidux, at the time I didn't really like the look of it, but lately I have been missing the fun of a bleeding edge distro. For me that always used to be Mandriva Cooker, but the dimwits at Mandriva decided to make that a DVD only distro from the latest version, and I would not download a DVD only distro even if I intended to use it full time like Mint, never mind for a testing version. So I decided to take a look at Sidux. I didn't find it as easy to set up as Mint, but then nothing is, and the lack of a Gnome desktop is a big drawback ( I don't really like Gnome that much, but I hate KDE4 so much it goes off the scale!) so I plumped for the Xfce version. I like Xfce, but it takes a lot more configuration to get it to my taste than Gnome does. I also decided to try 64bit as well. I have had a 64bit machine for some time but I always use 32bit OS's as it has up till now, always been more usable than 64 bit - I note that hasn't changed
My first download was corrupt and my second wouldn't even boot from the live cd (grub loading please wait!) So I gave up and went to bed having written off Sidux already. In the morning the live CD magically started to work (don't ask me?), so I installed straight away, which was easy apart from being asked half a dozen times to confirm my keyboard map (again I don't know why). The most surprising thing about Sidux is that it must be the only distro in the world that suggests you 'dist-upgrade' daily or never less than once a month! That makes it interesting. So I upgraded straight away (about 250 Mb) and it survived remarkably well - no problems.
The post install configuration was fairly easy for somebody used to Mint, it is mostly apt-get although they do have a reasonable package manager with a gui if you want it. The thing that impressed me most about it was the documentation, I seemed to be able to find everything I looked for without too much fuss in the manual and wiki. I installed everything I usually install and tried everything I usually try, and it all seemed successful. The only failure was googleearth, but that is due to 64bit not due to Sidux.
So with that exception I now have a fully working system that I could use on a day to day basis if I wanted, although I intend it as a testing system and a learning platform so I won't be using it in that manner.
If you crave the frisson of excitement that comes with a massive amount of updates, regular dist-upgrades, and the newest version of everything then it is worth a look. But for that same reason I wouldn't use it on its own!