Great thread, Stitch!
My exposure is limited to Opinels. Funny thing... I grew up with US style campers (boy scout knifes) and Buck hunting knives. These are the knives of *my* culture.
Later in life, I worked as a bike mechanic and this was back in a day when "French" meant "incompatible with any known standards". Working on French bikes while living in the US used be a recipe for cursing, mad customers and bikes left waiting for parts that never showed up.
It is entirely appropriate that I got my first Opinel as part of a package deal when trading bike parts with another cyclist!!!
I still prefer British and American bikes, still avoid French bike parts (Ok, I like Velox rim tape) but darn it all... the Opinel is my most commonly carried knife. By far.
It is like the Swedish Svea 123 camp stove or the Rottefella 3 pin binding. The Opinel #8 is simply one of those things that works insanely well. You're right about the #10 is a great camp knife.
Opinel #10 (drop point) & Opinel #8 by Pinnah, on Flickr