I have a similar story to Sarah. The stimulator saved my life and my sanity! I had a PICC in, could only eat tiny amounts of baby food, constantly in the hospital, etc. till I got it implanted last November. I have gained 25 lbs, can eat a big variety of foods, and have been able to go back to work/life, etc. There are still flares and I still have to be careful with my food.. but in general, it's amazing and I believe worth trying!
I'm about to return to the pump but haven't had them at the same time. I do wear the dexcom cgm and have no interference issues. My docs said there are no issues, just don't put them in the same spot because you don't want to risk the needle hitting the device.
For exercise... I'm hoping I'll still get better - and it's hard to tell because i deveoped an incisional hernia 4 months after my surgery. So really I'm not that far out from recovery. But I do have trouble in certain exercise I used to do - things that are really bouncy like zumba after too long I'm sore. For hte most part, I run, kayak, dance, and have a pretty normal life. I tried a belly dance class once... dumb idea, I lasted about 10 min w/ the pain. And agreed with Sarah taht you need to watch out for twisting.
No issues with dentist and don't know about tattoo- though I imagine as long as it's not over the leads or the device you'd be fine.
A great blog with details of getting and living with the device is here (though she doesn't have diabetes so it's not quite the same perspective) -http://livingwithgastroparesis.com/