Like the saying goes, "you don't know what you don't know" and if you already have a machine and know what features you might want in your next machine than that is a good starting point. If on the other hand you are looking for your first stringing machine or don't know all the features that are actually available and what benefit they might have than I have a simple starting place for you. I created a simple google doc with many of the features that machines have and this might be a good place for you to start. It's a designed to get you thinking about the features that are available and do some research from there.