I originally bought the Memory Boy just to add some depth to my electric guitar in live situations.
As all Electro Harmonix-Pedal, the case is rock-solid, heavy duty construction. The jack sockets are screwed shut, no wobbling of the jack plugs.
First of all, just a little bit of slap back delay gave the guitar a HUGE depth boost, instant big sound. I never turn it off anymore. Even just an almost inaudible setting adds so much warmth and depth!
But the fun really starts when you dial in the modulation. You can choose between triangle and square mod wave, and then between three rates via three-way switch. be sure to read the manual to know all the possible settings. Sounds from outer space ensue! With gentle mod settings I even got some super warm wobbly tape delay effects that I used on vocals and keys.
The Memory Boy is not a delay for super exact ms-delays or custom delay patterns, but instead invites you to experiment, and is very rewarding.