I have recommended to others to purchase the OHS radio over the standard Wifi-G radio that comes with the 3m-50 & 80 thermostats. For some reason after the move to the new company that RTCOA uses, the radios went to crap. Even before that the RTCOA supplied radio would go tits up for no reason, and the company would blame it on people's wifi equipment, network settings, not their equipment.
The OHS radio is a Wifi-B radio, and works very well, and never have I had any issues like I did with the RTCOA radio. The RTCOA radio, you can roll your own, due to the API is open source at this time. As for the setup for the OHS radio, you just plug it in, put back in the batteries, flip the power back on the furnace, and then go to the OHS website at my.cloudbeam.com and plug in the MAC of the OHS radio, and that is it. Very simple setup, compared to RTCOA's setup.