I've had my 2B for just over a week now and OMG. This is one fantastic piece of kit. I owned a basic model 2 a while ago but this is awesome. HFO is the norm rather than the exception. The 2B is particularly good with the mains adapter as the model I had before drained the twin batteries within a short space of time leaving me feeling disappointed. I used the audio for the first time today and was blown away. Thanks E-Stim Systems.