While some companies advertise the fast response time, 99% of the consumer-base will not be able to tell a difference. In fact, I remember a racer having to slow down the "high speed response" in his KO Mars-R. That was a couple of years ago. All of the high end radios (i.e., Helios, M-11, 3PK, and the Nomadio systems) are very solid units. Selecting one radio over another is a really just a matter of comfort and style. Good luck.