The original grey module will also work with the newer receivers. I have the original module in my Ko Mars R with the Micro receiver. It works great but I have noticed a few minor things the more I run it.

At low speeds I will sometimes notice a hesitation in throttle followed by what can only be described as a small 'spike' in throttle. Only happens at low speeds when I'm cornering so I'm going to try another servo to see if that is the culprit.

The other issue I am experiencing is the neutral point on the servo. It feels like I'm constantly adjusting it on the radio, but again it could be the servo again.

I visited Spektrum's website and they speak of two similar issues in their FAQ section.

Any suggestions?