Slightly late post this, but I thought it worth starting a thread since orbeas seems pretty active in the classified sections.
The good: I bought a Silstar crank off him back in June (2012) he gave me a good price and posted it nice and quickly and safely. Really friendly, helpful emails, he seems like a nice bloke.
The bad: the cranks were 165mm rather than the 170mm advertised. The BCD was also 118mm rather than the more standard 130mm that he told me (via PM) when I asked for confirmation. So a bit more tricky to find chainrings.
Not disastrous, since these are for a cheap SS/FG build, but perhaps worthwhile double checking any details.