I too only use Bernina bobbins. There is a cost difference between the 200 and the 430 bobbins. The 430's are much less expensive. One dealer told me that some other brand feet will work on the Bernina's. She sold me one. The metal is far less superior than Bernina brand. The metal was so thin and cheap feeling. I love my Bernina's. I have 5 of them. But then again, I have 20 machines.