I have been evaluating a Black & Decker RTX versus Dremel and I think that the RTX delivers more than double the power and has much higher reliability for prolonged usage. The common complaint on Dremel multi-speed tool is the variable speed switch tendency to go intermittent. The good point about Dremel is the variety of superb accessories that RTX doesn't offer. I have combined the best of both worlds be adapting Dremel accessories for RTX use. This includes the flex shaft, right angle attachment, and my latest modification, the drill press (see photo) ! These three accessories probably constitute all that is necessary for RC building. Any RTX users needing help, I'll be glad to !................