I just got a hold of a Boss HM-2 (heavy metal 2, japanese version)
I wanted heavy, chugging 80's metal tone out of my vox, and this is perfect.
Distorted and a bit fizzy, perfect for some needs. A bit of a one trick pony, but i got it for £25...
Also! very good as a solo boost when i'm using the UK 70's setting on my vox...
Heh, it'll give you a different sound at least :]