[j3ffr0]

I can only speak from my personal experience which is the lens I look through.

I have seen lots nylon string guitars without them that had badly warped necks. Most under $2,000 because that's what you find in the stores. Someone will always say it's possible to build/brace such a guitar in such a way that it doesn't need one. I've seen enough to the contrary that it gives me pause. That's not to say that I won't one day buy a higher end classical that doesn't have one, but it hasn't happened yet. Knowing that steel string guitars have way more tension, it's very unlikely that I'll buy a steel string guitar without the rod.

I've always bought guitars that had the rod. Some of these I've had for over 30 years. Other than a Sigma 12 string, I've never had a problem with neck stability. I've often given the rod in some of them a quarter depending on season to adjust the neck relief a bit. I have NEVER been sorry I had a truss rod.

The OP should be entitled, "Truss Rod -- Good or Great"