It was recommended to me to stick with the same product line so that I don't have to buy new feet, I can use the ones I have. I have the Bernina Artista 635 (special edition) and I love it, this machine sews like a dream. I am in the process of purchasing another Bernina to take with me to classes so that I don't have to take my Artista ( it is on the heavy side, plus every time you move it you run the risk of damage).
I can say that I am heavily invested in sewing feet, each one performs a specific task beautifully... the proper tools can make all the difference in the world.
imho!