Has anybody got experience (good or bad) with Vertical Card Compasses?

(Fore those who are not familiar with them, these are new type of 
compasses that are proposes as a replacement for traditional oil-filled 
compasses. They are dry, and have a dial that looks like a Direction 
Indicator dial).

Serge Vidal
KR2 "Kilimanjaro Cloud"
Paris, France 

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