If you can't tell the difference in tone between the battery directly onto the motor terminals and going full throttle at the transmitter then chances are you are getting 100%.

We use a Planet 5 transmitter and receiver kit, a v-tail mixer, and the Botbitz. Very simple, only complaint with the tz85s I suppose is that when you put the stick fully into a corner of its travel, it doesn't move. I assume this is some sort of mixer+tz85 combined issue as it didn't happen when we used to run electronize. It's not a problem in the arena, really, as you rarely want to do donuts anyway. :P