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When I worked at my LBS one of the reps came by with FOSS tubes. We bought a few but being $30 a pop they never sold. Also they were limited to 18-23 right when 25's started to take off. One day my boss just gave me a pair after they had been sitting on the shelf for over a year. Then they lived for a few years in the bottom of my parts bin. Recently I installed one on my trainer front wheel. I can't comment on road feel/flat resistance but I will say it definitely seems to lose air much faster than the prior regular butyl tube. These have aluminum stems. Also I think it might have come with a patch or two in the box.
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