[Batfish]

I feel obliged to add to this thread :)

Yes, I have the Nomadio Sensor and I love it. Keep in mind that they're updating the transceiver (receiver) and I don't think it'll be ready very soon since they're waiting for regulatory approval. The version 1 transceiver doesn't have a working RPM sensor, but you can still get pack voltage and temperature.
If you don't mind waiting, and don't mind the cost, I'd definitely recommend the Sensor.
The biggest benefit to me right now is the telemetry since all of my vehicles are "project" vehicles. When I run the Brushless Jato at the track, I keep the temp reading up on the display and glance at it any time a marshall is righting the vehicle. This keeps me informed as to my temps all the time. I check the pack voltage before and after each race since I run lipo (to be safe). I have the Sensor set to vibrate if the speed control hits 150F, so I know if I'm running too hot, too.
I could go on about all the features of the Sensor for quite some time, heh :)

Also, to give a frame of reference; I've used these other radios as well:
Airtronics MX3
Airtronics M8
Traxxas TQ
Other assorted AM RTR radios
Futaba Magnum Junior

The Sensor literally blows them all away in terms of features and options.