I also switched to Twinject when EpiPen redesigned. Now I'm back to EpiPen. Apparently a lot of people switched; Twinject is not available in my area right now and is on backorder "indefinitely". I called at least a dozen pharmacies in the area and every single one said the smae thing. Unfortunately, this does not leave a lot of choice for those of us that need to carry something.
I really dislike the new design. I like it even less now after reading these kinds of stories.