The range check works very well, plenty of ground range even with the Tx powered down. So far I have flown it in small parkflyers all the way up to my 70 size 1700w chipmunk, no issues yet. Response time is excellent, feels very natural when flying my little Tucano in a pylon style pattern which requires quick responses from both me and the gear!
I have plots from an engineer friend and they emulate the FAAST plots quite closely. He has also done interference & brownout tests and could not get it to lock up no matter how he dropped the voltage on the rx. Failsafe works as described, you can turn the Tx off with the sticks in whatever position and all controls will go to neutral, throttle off, turn Tx back on it relocks almost instantly.
Here is a review just posted, this guy usually picks things to death if they are no good so it would seem FrSKY is on the right track:
I have the module sets available in Australia
with local certification.