Trail Persistence :as the pedal is bypassed, the delay tail is not abruptly cut off, instead it decays out naturally. The same is true when changing presets (as long as you stay in the same delay mode).
Auto Regen (feedback) Sweep : when you engage this feature, the feedback parameter controlled by the Regen knob is slowly swept to the maximum value, hold it there, and then swept back to the original setting. Used judiciously, this feature can introduce dynamic elements to the soundscape - watch the demo videos to see it in action.
Analog Dry-thru : dry signal is routed through a pure analog path.
Small form factor : the pedal measures 12 x 6.5 (cm) or 4.7 x 2.5 (inch), pretty small for what it has to offer.