I wonder why you think Viskey bugs are not popular. I've had one for several years. I wrote an article for CQ magazine a few years ago and in the process interviewed Tom Desaulniers, the original designer and builder. As far as I know Viskeys are very popular and those who have them like them a lot. They are well-made and can easily be slowed down to 12 wpm or so. There are several contemporary makers of bugs beyond Vibroplex. There's nothing wrong with Vibroplex but some of the new designs have speed ranges that include significantly slower speeds without having to add a pendulum extender or more weight.