I have a Tandem T-slim, I guess the original one. I love how easy the menu system is, and how its touch screen so navigating is significantly easier than some of the other pumps. It's like going from navigating using an iphone to navigating using an old style cell phone.
I also love the relationship Tandem and Dexcom seem to have, I believe they will have a more integrated system (than they already have) soon. Maybe even a good 'closed loop' system.