I got a used DYNA w/the dip-switches, and am happy to have its rev-limiter capacity and ignition box functions in-place of the stock CDI ignition box.
The Ignitech has more features, but wasn't available plug & play for us when I needed a box to replace a faulty stock unit. I didn't want to spend the $$$ for a stock Yamaha box, and the DYNA has provided me w/good service. I have caught the rev limiter a couple of times so I know it works. My take-if you have a chance to buy a DYNA at a good price, and new or used, it's less than an Ignitech, and you wouldn't use the additional features the Ignitech allows, then the DYNA would be a good choice. If you are gonna spend more than your bike is worth on modding it (2X, 3X, 4X...?) then maybe the Ignitech is for you right from the get-go.