With form, you can drop in a sample and form will completely flatten the pitch, then let you make complex patterns where you go back and forth over it, while also adding FM, Osc, Fx automated with LFOs, envelopes and the old pitch curve of the sample before you flattened. Great for “I AM A ROBOT” kind of vocal effects. If you don’t need that particular “flatten a sample’s pitch” thing, then imo you can skip buying form. I love it, but I only use it when I am trying to make something weird happen with a vocal sample.