When I use a delay, I usually have a specific effect in mind, and tend to judge delays by how easy it is to go from imagination to reality. When I tried MFM, it did not suit me at all. I got some very cool effects, but it was entirely by accident.
Still, there's something to be said for serendipity. Valhalla UberMod similarly falls into the Forrest Gump category of effects, which is to say you never know what you're gonna get. Sometimes it works wonders while other times I just say the heck with it, pull up the good ol' sensible Sonitus and move on.
Timeless2, I think, successfully straddles the line between depth and simplicity. Oh, how I wish I owned it! During the Christmas sale I could have gotten it for $58, but no matter how many couch cushions I upended, all I could find was $13.58.