The description here does not do this product justice at all. Please go read the product page at the Rob Papen website.
This delay may not be for everyone, specifically people working with recorded audio, or in more "organic" genres. Basically, if you need your delays to sound "real," this may not be the best product for you. Sure, it can do "natural," but so can two dozen other delays that you probably already own. That kind of application is not where RP-Delay shines.
However, I think this could be the best delay out there for electronic / EDM, or any genre where delays and FX aren't always expected to sound "real." It really excels at highly layered, variously panned, heavily filtered and distorted delays. A total dream for creating wild effects.
It has two main delay lines (1 and 2), and each has four sublines: A, B, C and reverse, each with its own mix knob (dry vs wet), level, panning, feedback, filter type, and distortion type. All sublines can be set by sync, or by very accurate ms. Each subline can be triggered by a MIDI note. Each subline can be fed by the main input, or by any of the other sublines (see "position"). It has a master mix knob, master stereo width knob, master 3-fixed band EQ (low, mid, high). Also has master volume triggering, sequencer and Audio Follower.
It has a highly variable CPU load, depending on the patch (many, many awesome presets).
The only other delay plugin that I know of that allows such precise control over so many parameters is More Feedback Machine by u-he. The main difference to my ears is that MFM sounds more analog and RP-Delay sounds more digital. This same distinction holds true for u-he synths vs RP synths as well, imo. They both have their place. The price difference between the two is not huge, so maybe try both and see which one you like more.