Based on this thread, I decided to get one. eBay, $35 shipped. Frankly, I was expecting to be disappointed, but wow! I'm convinced that I should have gotten one years ago, as I would have saved quite a few bits that I broke because they were dull.
Very impressed with the finish I got, and the angles appear to be right on. Tried a sharpened one in the lathe, and it cuts better than new, with the curls coming off evenly and smoothly. I'm a believer!