Originally Posted by RCGaryK

Yes, the Pro Series gear is totally compatible with the Original series. One thing to note is that you will not get the full advantage of the Pro Series unless you're using a Pro Series Module and Receiver. You'll see approximately 1/2 the improvement in latency. Spektrum’s first DSM system added an additional 5.6m/s of latency into the total system latency of a radio and its module. Again, we’re speaking in terms of thousandths of a second here. With the Pro Series Receiver and an Original Module, the latency will be approximately 4.3m/s, where a full Pro Series system is only 3m/s. Hope that answers your question for you.