I have to agree with the Joslin center.
Islet transplants may seem like a good idea. especially in thos with Brittle to give them a fighting chance. the prednisone to prevent rejection howevern it adds the extrta burden of higher glucose levels.
One also has to consider that eventually these beta cells will also give out.
everything has a life and transplanted cells only have so much to give. Which is why those have receieved them are stillw ithn a 7 year window with events being seen as a decline in insulin production.
So they are still on insulin within 7 years as of right now.

I for one woudl only ocnsider it if they could extend the life of the cells for 10 years. I woudl willfully watch everything I ate so as to prolong it. But many simply feel that " hey I got new cells I can eat everything and anything I want".. and so it goes.........