• A) Is this really saving much effort for the weight penalty + complexity?
    B) Should'nt folk be carrying said tool for chain adjustment anyhows?

    Not if you have chain tensioners and schwalbe marathon plus tyres and/or a i'll take it to a cycle shop if i get a puncture attitude. Or the will/stupidity to fix a puncture with the wheel in the bike.

    Tbh though screw-on freewheels are a chore (imo), half of them leave you two teeny dogs to remove them and on average they are a cheap replaceable component. I know white industries monty etc all make loverly 3/32 freewheels. Are they as good/reliable as an internal ratchet/pawl drive freehub?

    The benefits of this hub as far as i can see..

    Remove/change sprockets with a screw driver in a matter of seconds (also no probs getting 19T sprockets, seem to be in short supply atm).
    Hopefully less eccentric than a screw on freewheel (less tight spot).
    Swap between fixed and free without removing your wheel (clean hands).

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