Those Opinels are great knives, for what they cost. The blade shape and length, plus the very decent carbon steel and convexed edge profile make it a really good slicer. Far more useful for food prep than most other pocket knives, and very light in weight. Some great features, for under $15.
The reason I don't carry one, is because I don't trust the locking mechanism to keep the blade tucked inside the handle while it's in my pocket. It seems to me that these knives were meant to be carried in a picnic basket.
The sodbuster-style knives are more appealing to me. Similar to the Opinels in some ways, but safer to carry. Some of the best are made in America, ... such as the original Case "Sodbuster", and Great Eastern Cutlery's (Farm & Field #71) "Bull Nose". They cost quite a bit more than an Opinel, but aren't so easily lost, if you order one in bright orange.