what is handy is that if you test your BS and say your over your set limit ie- 7.9mmol and you are eating out and want to give an extended bolus, the handset will not let you do this.
You can however do it from the pump itself, so if you input the carbs on the hanset and let it work out your insulin dose you can then do the extended bolus from the pump using the insulin dosage fro the handset.