I've had the EHX Memory Man with Hazaraï for a while now, incredible stuff. Probably not the best sounding delay (all digital), but one of the most versatile I found. You can easily find the specs, modes, controls online so I'm not gonna repeat that. But the thing at which this excels for me is auto-oscillation/feedback looping. With its two in/outs it doesn't need a mixer or anything, and each delay mode equals a different auto-oscillation mode ! Special mention to the auto-reverse mode, which sounds like abominations from hell or something.