No experience, but I wouldn't feel comfortable relying on a suction cup to attach to my Plus Six. How long would the vacuum last during dynamic load conditions, and would there be any damage (due to either short-tem or long-term use) to the bodywork or paint? The MMC and Librands racks minimise that loading. Is it secure against someone wanting to remove it overnight? If not, that means I'd have to take it off and put it back on again each morning.
And the company mentions that it has been "independently tested and certified", yet the standard referenced states (my emphasis) "So-called magnetic or suction foot racks, i.e. roof racks whose attachment on the vehicle is only via magnetic forces or vacuum, are excluded from this document.", so caveat emptor!
