Hi Tracyann35. To be honest, I've had the 640g for 4 years now an I must say I've been very happy with it; it's a good modern looking pump, that I've found easy to use (once all set up correctly). People say about lots.of button pressing to get to different menus etc, but I didn't really find this an issue. These pumps main features though are more suited to using with CGM's, but I never did and found it still good. I upload my results to computer and email them to my hospital for reviewing occasionally. I was offered the 670G which is the newer version. I'm considering the T-Slim because I think it looks better, is smaller, and potentially could be compatible with the Libre 3 next year, which would work as a CGM. I currently use the Libre 1, and will use these BG results to manually enter into the 640 to give meal bolus settings or corrections. I know this is frowned upon because of the differences between finger pricks and scan results, but I often struggle with my fingers and getting blood from them! Obviously pumps are personal, but I genuinely don't think you'd be disappointed with the 640, it is good. For me, I just think the T-Slim may be better suited now. Everybody will advise different reasons, so go with your gut feeling. Good luck. Let me know if you want any more details though, I'll help if I can. We've all been in this situation , getting overwhelmed with information!