Anyone who says ring tools are difficult to use doesn't understand how to use them properly
They are easily sharpened with a flat hone (all I ever use is a diamond credit card hone).
I use them frequently on both wet and dry wood for hollowing and if used correctly, those dramatic catches people talk of are non-existent and the finish is far better than achieved with carbide tools or scrapers because you are making a bevel supported cut just like you would with a gouge.
If you look at this
goblet turning video, I show the use of a ring tool about 20 minutes in.