I would argue that at this time, all the remaining pump manufactures have durable designs. Durable eletro-mechanical mechanisms are now commonplace and the manufacturing processes are understood and controllable. So, your decision point lies in what features you are looking for in a new pump.
Omnipod: Small, discreet. No tubing to get snagged on passing the evil door knob. The interface is getting dated. Can't speak to Omnipod's customer service.
Medtronic: First to market. Deep pockets for development. They seem to have forgotten their interface is part of their R&D efforts. Same-same interface they have had for years. Cannot update without following their 1990's "hear buy another pump program outside of insurance." Customer service has been going downhill for many years.
Tandem: Small and innovative. Can't help but worry if they will survive with the likes of a behemoth like Medtronic. You can update the thing without buying new, and their new features seem to be solid if a little late to market. Best interface on the market. Customer service is what Minimed used to be.
I think Tandem is the technology pipeline market leader right now. The 670 seemed really awesome at first glance, but I do not like the finicky sensor or the upside down interface (who designs an interface upside down with how you look at it on a belt clip?). My feeling is they went fast-to-market verses ready-for-market. That is why I like how Tandem is approaching the upgrade. I make the choice to upgrade, and I can wait a bit to see what people think. Finally, as I already said Tandem's customer service is what Medtronic used to be.
I was so frustrated with Medtronic's lack of customer service, I paid out-of-pocket for a Tandem because United Healthcare has a sole source agreement with Medtronic. I have not looked back. Solid product and service, adn I don't have to deal with Big Med.