I just bought a Helios KO PROPO C2 limited edition remote, its lighter than the other remote i've tried, and the handling is very convinient.it's using 40 mhz channel, its very odd becuase they put out a 27 mhz for the remote in america.
the price is very expensive for a remote , but i worth to buy if you're a pro driver, it gives you more handling than other expensive (460 usd ) remote i've tried before







it allows for advance HSR, using light weight aluminum screws and handle.
for more detail:http://www.kopropo.com/EX-10_helios.htm