I'm on my second combo pump. I considered switching from the combo after the first one, but tried some of the Medtronic cannulas and didn't like them as much. Also, I frequently infuse meal time insulin using multiwave bolus over 15 minutes, and if I remember correctly the shortest time Medtronic would give a split bolus over was 30 minutes. It's a while ago, so I could be wrong on this. Thirdly, i wanted my target blood levels set lower than 6.7 and there's no flexibility with Medtronic when the pump is automatically correcting blood levels. Lastly, i couldn't get the sensors on prescription, so all in all am glad I stayed with the combo, but it's very much a personal choice.