some turn out really nice :)

couple bad features IMO:

    - sometimes painted with toxic paint
    - have to insulate anyway
    - have to frame the interior walls with wood and then drywall tape & paint anyway
    - have to weld them together
    - worse energy efficiency than concrete (IMO)
    - can be hard to find

IMO the 9 - 10' ceilings are cool though, and the 40' length is really great.

I'm still leaning towards concrete -- With a simple roof one end higher than the other. Concrete and tile seems to be insanely efficient to keep cool in hot weather. I'd love to use ICF but it seems to just add 10k to the price without any other benefits that I can save 10K by doing the work myself.

these look really cool also: http://www.homedepot.com/p/SmartBlock-Twenty-8-in-Insulated-...