Tried one out at work today... that little box is AWESOME! The basic delay features were very awesome, but it wasn't until I started playing with the knobs AS I WAS PLAYING GUITAR that I really noticed some cool stuff. If you max out the feedback and effect level and start playing with the delay knob, you can get some really trippy echo feedback type effects. I just wish they had an expression pedal so you could play with the settings while you're playing a riff on guitar.