I swapped from the Combi to the medtronic 640g a fortnight ago...
I would have stayed with the Combi if I hadn't decided to self-fund a CGM (Which I finally got the approval to order, as Medtronic insist that you have your diabetics team agreement!)
The change over was pretty easy, as the menu's as I found the menu pretty intuitive, I do like that once you've set the reminder for how many days for set changes, it will automatically remind you, and resets every time the set is changed without you having to tell it. Very handy for the likes of me, where life is hectic and often forget this part oops
I found the screen display a lot better than the Combi, I can see it clearly very easy to take a quick peek at discretely And I've got used to quickly knowing what I can do and not do, on meter and pump.
I don't use high amounts of insulin, so having a choice between 3ml or 1.8ml cartridges brilliant, I've found the 1.8ml to be ideal for my needs, as Medtronic recommends change cartridge, insulin at each set change.
Another bonus I've found, is the cartridges due to their design having a lot less issues of bubbles when filling, and so far no issues with bubbles in the tubing 🙂