I agree that the TX does not feel cheap just light and I guess some that run a 1 hour main if there are is not tired from holding there TX they think it is cheap. I like a light TX.
I bought a 2500 pack made for my React which is much better then the stock 800 fro $16 shipped!
http://www.cheapbatterypacks.com/?sid=1529231 I use this charger to charge it and all my batteries other then Lipo. The only LiPo I have right now are for my helicopters.
http://www3.towerhobbies.com/cgi-bin...?&I=LXCLD5&P=0
I have never had a problem down loading or up grading the soft ware in my RX or TX and in the first 3 moths of owning my React they had to replace it 3 times. [X(]
As far as the tack speed sensor I never ran one so I know very little about it.
I will PM you a link that I hope will help you set up your kill switch as if I post it the forum police with smack my hand AGAIN.
When setting up the fail safe on the TX what every channel or channels you use you have to leave the TX on SET not hold. When setting my My PB switch and fail safe I make the throttle channel to apply the breaks. So on mine on the throttle and 3rd channel for the kill swith you have to set them to set and leave them on set and then set your fail safe mode. If you put it on hold this will not allow what ever channel you have hold on to do nothing when setting the fail safe mode. Pleas let me know if you get the link OK I am going to PM you shortly.
Dont you love the manual LOL The React has SO many features the manual is well over 100 pages. [X(]
If I can help let me know and I will try.