The Phase 90 & Small Stone are one knob phasers, only capable of changing the rate. The Phasor II also has knobs for feedback and depth, so it's much more versatile.
Try this link for John's clip:
Yeah JohnK's stuff is the best. I have a few and they are my never sell must have pedals. Wishing I had the cash and the pedalboard space for both of these! Somebody should snag these ASAP