Dahon.Steve: you mention locking up a folder so I feel compelled to put in my 2cents.
I don't own a bike lock and my folder never leaves my sight.
The whole point of a folder to me is it CAN exist without a lock.
I couldn't afford to replace a stolen bike so bringing it inside seemed like the perfect defense.
I really love where the KHS can go. Concierges, bar-tenders, bus-drivers - all seem so awestruck they don't mind the folded bike under their care.