Drove a DX3C first, then a 4PK, now just bought a MT4S and I'm super excited.
You defenitely feel a difference between Spektrum and Futaba, Sanwa,...
I think Sanwa with their MT-4S is the leading for the moment, although I liked the 4PK allot, futaba support sucks, and I think their products aren't that good quality either.
We will see what the MT-4S brings. The 40th anniversary looks damn awesome, can't wait to have it in my hands