They feel nice in my hands and the yarn slides well across the wood and across the join. The only reason it is not yet 5 stars is because I can not yet say that they have longevity because I have not owned them all that long.
I used these to complete a baby nightgown. I didn't have a noticeable change in guage.
I like the way they feel in my hands. The wood is smooth and feels sturdy. The surface is smooth but not slick. The cable is flexible but not flimsy and the join is smooth.
As far as the claim to be better for those with carpal tunnel or other hand issues, I found that I could knit somewhat longer before my hands began to complain.