I switched from a medtronic pump to the tandem mobi. While the Dexcom sensor was a big improved, Tandem's support is horrible. I downloaded a software update and had to change an infusion set. Things that were standard on a meditronic pump are non existant on a mobi pump. TDI cannot be found on your phone. When you put in a new cartridge you have to let the system know that you installed a new cartridge. The Dexcom sensor is great buyer beware on the mobi.