Reverb and delay junk here
With synths (Moog or Clavia VA and Electro) I use an EHX Cathedral as stated before. It can't go Massive Attack's pristine, but it's quite complete and tweakable for the price and footprint. Mine is quite all the time set on spring settings as they can give a nice vintageish character to the sound.
Same for the Boss RE20: the reverb gives a nice color, however it's not tweakable. A pity.
The 104 can -under certain settings- sound like a springy-boxy reverb. I like it a lot, it's like just wetting a bit your synth sound. It's obviously a nice delay.
Oh: I tried a real spring reverb stompbox, the Headroom. I think there is something wrong with impedances or... (well I'm not too familiar with that

) anyway: I often make springs distort, as if the synths' had too hot outputs. At low settings though, I can say that it does not behave like with guitars: spring reverbs can make the sound character of a guitar part. Here, it only wet up your synth sound, again. That's cool but more restricitive.
I also use an EHX Deluxe Memory Man with TapTempo. Another character, wilder, more in the mids than in the dark shades. Very tweakable, very reactive. Great for synths if you want something with more attacks and less paddy. Just as the 104, it has this external feedback loop (I burnt mine once with a POG2 set to -2 oct in the loop...)
I tried the EHX Deluxe Memory Boy as my guitarist has one he makes sound gorgeously: quite different than the former and not my cup of tea for synths. That being said, a lot of people like it.
Hope this helps
muksys wrote:Check out the Strymon El Capitstan. Great delay pedal with spring reverb as a hidden feature.
Really?... I didn't remember it had reverb. That's what discouraged me from getting one, with respect to the RE20. The later is quite huge and I prefer a light set up. Thanks
EDIT: ...or... I gave up when discovering the reverb setting was a feature set via a button combo.