KO.
Purely because the receivers are tiny - half the size of the futaba 614
However, they are fairly expensive and on my EX10 with the same rx (kr411) CH3 and CH4 are only available in the slowest latency mode. Nobody in the EX1 thread will answer me with regards to this on the EX1, so it's probably the same. Not a big deal, but a bit disappointing.