It's one of the toys that every guitarist tries at some point. I think my first experience was part of a cheap multi-fx unit, maybe a Korg Toneworks, maybe ten years ago. Being fairly new to playing guitar, and playing a Squier with really nasty sounding singe coil pickups, it all sounded rubbish. I started playing my bass in a 3-piece grunge band not long after, and needed a really huge sound.