Pump info Pre-Pump

I was wondering if anyone could give me some information about the pump that you don't always read or hear about prior to getting the pump. I am 2 weeks away from going on the Tandem T-Slim! (Woo Hooo technology!) I have heard that the infusion sites can hurt, stop working etc. What else can happen on the pump? Also has anyone experienced weight loss or weight gain with the pump? What are some things that you love about the pump and perhaps what do you hate about the pump?


Any info that you can give me would be greatly appreciated!!