A lot of people make that mistake, and it's a shame. Opinel's are very good knives for a very small price. They can be deceptive, in that because of the simple construction and light weight, they seem cheap and flimsy. But an Opinel is far more rugged and durable than you would believe. I got my first one in 1982, and have been adicted to them ever since. I think it's the slice and dice abiltiy of these things. An Opinel cuts like very few other knives, and is so easy to touch up the edge. Once you get used to them, it's hard to go without one.
I've found the stainless Opinels to be just as good, if not a bit better than the carbon blades. In 2001 or so, Opinel switched their stainless to Sandvick 12C27, and takes full advantage of the heat treat to get every bit out of it that they can.
Once you sand and shape the handle to your own spec, it becomes a personalized knife.
Carl.