Add me to the list of satisfied customers. Dfischer, if you are unsure of whether or not to get a RailPro system, just try using a DCC controller, then try a RP controller. There is literally no comparison. Another benefit of RP is that it can be updated/upgraded instantly, at your home. There are exciting new features in the works as the folks at Ring Engineering work to make the system even better. As was stated above, if Ring had to exit the market for some reason, I would buy up as many modules as I could get, and if that were to happen, I would think someone else would probably pick up the company. The product is that good.
Considering that there is a relatively small dealer network, most of whom do not push RailPro, and the fact that Ring Engineering doesn't go to train shows other than Trainfest, the user base is growing. When folks see it and try it, they eventually buy it. I have converted three of my fellow club members. The main aversion I have experienced is from guys who have a lot of money invested in DCC equipped engines. That is really not a major consideration since RP locos can run on DCC power.