Thanks for the response zuludog. I guess I should have been more explicit. I have been hand stitching for as long as I have been in this hobby (a couple years now) using various methods. I mainly use the diamond chisels from Tandy that I originally started with (I have the 5SPI set as well as one of the new "fine" diamond chisels that runs 7SPI). I have also experimented with using an overstitch wheel and piercing manually with an awl. I much prefer the workflow of using the diamond chisels, but in my quest to take my stitching to the next level I have started thinking that I need to use a pricking iron.
In this case, I'm not using pricking iron as a generic term. I am differentiating between pricking irons--which make a very thin / / / / / shaped mark meant to be followed with an awl--and diamond chisels, which make a larger diamond shaped hole and can be driven all the way through the leather. I think for really elegant looking stitching that exaggerates the slanted pattern I need to start using a pricking iron. I just don't want to spend $280 on a set from Vergez Blanchard. This is the only decent looking substitute at a reasonable price point I have seen. I think they are pretty new, so I wouldn't be surprised if no one has used them, but here's hoping...