In terms of convenience & on the fly changes (& being able to leave clamped on the headstock while not in use) the G7 Performance is pretty handy but not 100% happy with how it frets, particularly on the D-28. By the time it's cleanly fretting the middle strings it needs extraordinary pressure on the outside ones, works somewhat better on the Maton for some reason or another, probably different neck profile.
The Shubb Deluxe on the other hand only needs a light preload on the screw/micrometer & frets all 6 strings cleanly & effortlessly, to the point it sounds as good as the nut itself, even up to 7th or 8th fret, particularly on the Martin.
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Mick 
Martin D-28
Maton EA808 Australian
Maton EBG808 Performer
Cole Clark FL2-12
Suzuki Kiso J200
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