I've just been contacted by Medtronic as my 640g pump ends it's warranty in Nov and they suggested the 670g, however as it requires additional funding I have to present a case to my team as to why they should fund it, currently using the Dexcom and quite happy with this system, however after reading your comment
@MeiChanski i'd be curious to find out more from other users first to see if this is the right direction to go in, can you tell me where you've seen feedback on the 670 ?
My diabetic nurse also works with blind type 1's so will ask her about audio pump systems.