Why spideroak instead of dropbox?

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http://forums.opensuse.org – Hi: I'm using OpenSuse since version 11.1 I believe. I like it very much, now I'm about to upgrade to 11.3 and reading about the new features I saw it has spideroak support integrated. Since I didn't know of this product I checked out the website and saw no significant difference with my current cloud storage (Dropbox). As a matter of fact, Dropbox integrates perfectly with different distributions and operating systems (The only problem I found was installing for different distros, which would be solved by having it built into the system). Anyway, I'd like to ask (Distributions)