Hi sllo,
I am also running a React and let me start by saying I'm very happy with it. I upgraded from an Airtronics MX-3s mainly to get 2.4GHz techonology since I didn't like neither the DX3 nor having to buy a $300+ top-line transmitter and a separate spektrum module and receiver. Compared to other options, the React gets much lighter both on your wallet and on your hands.
What's more, on top of the 2.4GHz technology, you also get all the setting and tuning options you can imagine in a radio. Have a look at the manual found at
http://support.nomadio.net/react/ to get a better info.
It's true that the first software that came with the React had quite a few bugs, but those have been progressively removed with the release of newer versions, that you can easily download from React support web page. Talking of which, there's also a nice user forum there as well as a fantastic customer support.
As for the temp sensor, I haven't got one yet so I'm of no help here. However, keep in mind the React temp sensor does NOT measure the glow plug temperature, so it quite likely you're going to get a different reading. But eventually I'll soon figure out what that offset is and can adjust the reading accordingly.
To conclude, I'd definitely advise you to get one yourself. Then we can really realize what you've been missing.
All the best,
Andre