I have two, the Barber Barb EQ and the Maxon AD999. I use them both to make my little Gibson amp sound bigger. No obvious delay happening, and the EQ either adds some treble or cuts the mids for a Fender blackface sound. A lot of money for that little something that does big things for a 5W amp and 8" speaker. Quite a contrast to my early days of turning all knobs to 10 to get my money's worth out of an effect.