Xotic are doing some of the best booster pedals going around. This one has plenty of gain range on tap, so it borders on distortion when cranked right up. The EQ is super powerful too, so you can dial it in just right to get your guitar and amp getting along as well as they can. It's very warm and smooth.... yum. Plus, you can see it in the dark easy.

Model: Xotic Effects AC Booster
Made: USA, recent model
Type: boost/preamp
Power: standard 9v negative supply (not included)
Equivalent new street price (approx): $255aud
Mods: velcro attached
Accessories: original box and docs
Condition notes: used, no major marks, excellent condition