I can say my experience... not even a fart....

I know i get the lower end ones... but come on...
Real world stuff...

-Brand new 2.4ghz radio come of the Losi Mini8... range was around 40meters.
Bought a Kyosho KT201 and range is real world not a mistaken 500meters.
That's even more 100meters then the Sanwa Mx11. And that Kyosho cost around 30euros and i still use it after 5 years of intense use!

-Blade helis with dx4e... goodbye. Bought a fancy Dx6i... computer programing, cool! But sometimes helis come down with no aparente reason. They lost there tranmission signal??????? What... Spektrum? Helis? Can't go down for lost of signal, more then 6 times in these 4 years of Helis use...
And at 10 meters of close... not at 1.7kmh of supposed range in the stick remotes!

Goodbye "Spektrum" garbagde. To bad i love the Blade helis.