Super intuitive on the surface, with lots of only-slightly-less-intuitive additional functionality that operates as Tier 2/Under The Hood features. Firmware updates gave it new features that didn't completely redefine its core functionality (or the users' understanding thereof).
Also worth noting that at the time the EDP was introduced there wasn't nearly as much competition in the looping delay market as there is now. You had the original Boomerang, the Lexicon JamMan, Line6 DL4, the Electrix Repeater (I think?), old/unreliable Electro-Harmonix 16-Second Digital Delays if you got lucky on the 2nd hand market, one-off modified Lexicon PCM-42MEOs if you got in tight with Bob Seldon, and the very first iteration of the Looperlative LP-1. In comparison to all of those, an EDP either
- offered better fidelity
- offered more functionality
- offered more ease-of-use
- offered a warranty