It seems like most here are coming from more a rock perspective with their use of Reverb and delay. I may be more older R&R, blues and country- so I always have Spring Reverb ON ( Fender or Vox Amp). And then I kick in Slapback delay for Rockabilly and surf stuff. ( mine is a little bigger/ more exaggerated than the usual) But I rarely play without Reverb. I just got this Donner RevEcho-Reverb and Delay combo specifically for new a Supro amp, whose Spring Reverb is OK, but I wanted to hear better. This new pedal is very cool in its layout and design (both effects, good controls) but I wish the Reverb were more Spring-like than what I'm hearing. But it sounds better than the amp's Reverb. .