I should have just asked my dealer the other day when I was in buying my zipper foot, but they were busy and my husband and kids were waiting in the car. So I'm asking here! :)
I was buying a number 14 zipper foot the other day and a regular one was thirty something dollars, the D one was eighty something. I went with the D one because all feet were 30% off at the time and I had a $20 store credit. That brought the 14D foot down to basically the same cost as a regular one.
What is the benefit though to buying the D feet for my 820 as opposed to buying the non-D feet? I understand my machine will recognize which foot I've put on when I place a D foot with it's sensor on it, but what other reasons are there for spending the major extra bucks for D feet?