I'm yet to hear a bad sounding Xotic booster, they're all very good. This one has some fun mini dip-switches on the side to alter the EQ curve, which is fun. There's heeeeaps of boodst on tap too, you can really get your amp cooking. 

Model: Xotic Effects Super Sweet
Made: USA, recent model (serial SSB02675)
Type: boost
Power: standard 9v negative supply (not included)
Equivalent new street price (approx): $215aud
Mods: none
Accessories: original box and manual
Condition notes: used, no major marks, fully functional. Overall: excellent condition