Scott55: Thanks for the comment.
Paul: The threads are holding up extremely well, even though there are several which are a bit chipped. This was primarily caused by the grain direction not being all that compatible with the thread shape. The screw is poplar - believe it or not. Which also contributes to the chip out. I am fairly careful that I don't drop whatever I am clamping onto the threads. The vise is only about 1.5 months 'old' - don't know how the threads will hold up over a longer period. I have a 2.5" maple dowel waiting in the wings - in case.
I cut a trial roller stand nut out of home improvement store 2' x 6' to the get the dimensions right - fully expecting to cut the final version out of better quality stock. However, the quality of threads was so great, I decided to cut another nut from the 2' x 6' and put them into their full intended use.
I didn't take a pic before I gave it away but I cut a lidded box from alder. It turned out great.
Thanks a ton for developing the Threads gadget.