There is an interesting thread on the DE side of this forum, where new user Wonko was asking about the difference between pure Sid and siduction, and about the stability of siduction in comparison to other distros. With the help of google translator and a smattering of German I can read it, but I cannot write grammatical German, so I will put my two cents here for the English readers.
My experience from about 7 years of running sidux > aptosid > siduction is this: Most people, like Wonko, think about OS "stability" as an attribute of the installed OS itself. In other words, it is an inherent characteristic, like the horsepower of a motor or the color of a car. But I don't think this is the correct understanding of "stability" in the case of a rolling release like siduction. Because of the way new packages and upgraded features of Debian sid are introduced, the system might run forever in the configuration it was in on Sunday, but be destroyed by a dist-upgrade on Monday. For the wise user who is following the recommendations of the siduction development team, in reviewing the apt-get output, and checking the "Upgrade Warnings" forum here, the choice will be "n" on the dist-upgrade question on Monday, and that system will not be damaged by a temporary chaos situation in the Debian sid repos. Therefore, I say that the stability of a siduction system is more a function of the user's care, and adherence to the official recommendations, than it is to any inherent attribute of the OS. My sid-based systems have never become unstable just because they were Debian sid -- they only suffered if the user got careless and/or impatient and broke them.
I am writing this on my big desktop rig that I built in 2010. I reconfigured the hardware in mid-2011 and reinstalled aptosid "Imera" on it, and then "cross-graded" it to siduction at the beginning of 2012. This morning I ran d-u and pulled in towo's new 3.15-rc5 kernel, plus the available sid upgraded packages, and rebooted. I am confident it will be running 24/7 until the next kernel becomes available, because it is
very stable.