rdemler,
I will relate my own experience with wood burning tools. I bought and burned up 3 of the cheaper model wood burning pens with the screw in tips in just under 11 months. The name of the suppler is irrelevant as I suspect most of these wood burning tools are manufactured in the same place, probably in the same plant just packaged in a different box. I figured at the rate I was going through them I should quit throwing good money after bad, break down and buy a good unit.
I researched several Optima, Burnmaster, Razer,Nibsburner, Colwood and Detailmaster
I settled on Nibsburner Red Hot unit. I bough it at the Dayton Artistry in Wood show. It is American made. The cost was $137 with an interchangeable tip hand piece and a chisel tip. The additional tips run $8. The unit was highly recommended by the pyrographers I spoke to at the show.