I have these cranks and I love them so far. Though, I've only had
them for about half a year now.
It seems to me that only the outer chain ring is special order. It
looks to me like the inner chain ring mounts to the outter ring with
standard chain ring bolts (I haven't actually diassembled it yet to
verify, but I'm relatively sure I could mount anything as the inner
ring to this).
So although some of the parts here are non-standard, it'd be pretty
easy to get a replacement spare bit for mounting rings to the outer
ring if you were really that worried about losing one.
Yeah, I had to special order this stuff from the bike shop, but I
don't go through chain rings enough for this to be a problem having to
order a new outer chain ring in the future. The flexibility in
choosing exactly the gearing I want is worth it. I was a little
worried at first about shifting performance with weird ring sizes and
my veloce derailer, but it shifts fine. I'm using a 30T inner and 46T
outer.
I'm not sure what the comment about coloured parts is referring to.
The crank arms are a nice shiny silver, and the rings black. Mine are
dirty right now, but look just fine.
-ryan