I've never used a hand priming tool that didn't stress out my hand in short order. The only exception is the Lyman 310 tool that I use for .38 Spl. and ACP. The problem there is that each shell holder amounts to a separate die, and they're becoming hard to find. I have both the Lee and RCBS Ram-Prime tools that work equally well, using the standard shell holders. Never tried a bench-mounted unit, but they look pretty good, too.

Larry