Welcome to the forum
@Squeen
I switched from MM640 to Tandem tSlim, initially with Basal IQ (quite like Medtronic’s predictive low glucose suspend), and then upgrading to Control IQ. One of the nice things about the tSlim is that you can opt to update the pump software as new versions are released rather than having to wait for a new pump. Control IQ is Tandem’s hybrid loop, with bolus and basal increases if BG levels are rising along with predictive suspends.
All the main infusion set varieties are offered on tSlim, but there aren’t multiple choices of each, so it’s perhaps a slightly narrower choice of infusion sets (mostly Mio-style self inserting), but steel ones and manual insert teflon too.
The pump is much smaller and neater than Medtronic, and has a pretty well thought-out and user-friendly menu system with a full colour touchscreen. The reservoirs are a little bit more fiddly to fill, but the benefit of the smaller pump size massively outweighs that once you get used to it.
If you have a smartphone, you can download a tSlim emulator app and have a look round all the menus and get a feel for how everything is laid out, which I found really helpful before making my decision.
It’s a very individual decision, and any pump/sensor combo will have things about it that drive you crackers, but I think tSlim and Dexcom is probably the best combination of tech I’ve used, and my Time in Range has never been better
🙂