I only have a few, and nothing high end. That said, my Becker Necker is by far my best neck knife. Its very sharp and well built. Some people have problems with the skeleton handle because there is a "beer bottle" opener at the end that can dig into your hand. I've not had this problem, but I haven't done hard work with it. Its cheap too.
I'd also highly recommend looking at Tom Krein's knives, he's got a couple of neckers that look great.