Incra's original positioner, still marketed, is similar to the Jointech you bought. Really functional, and I've seen posts on a few news groups on how to make your own templates for the Jointech. Doable, but do you want to do the work. You got a pretty good buy on the Incra LS, and with all the templates and the project book--you'll have enough to keep you busy AND more importantly, help you see other ways to use it with your own creativity. Knowing what I know today, i'd keep the Incra. If, in two or three years, you're not woodworking, you'll still easily make a few dollars when you sell it. If you sell the Incra and tinker a bit with the Jointech--you'll end up buying the Incra system back at retail. Cheaper to keep the Incra now!!
(in case you're wondering, I passed up a few great deals on the predecessor of the LS, and bought a used original version cheap. Less than a year later--I paid close to retail for the system you have, and while I don't regret it--it would have been good to save the dough!!)