They're everywhere for a reason, just like coffee or shirts. This is the queen-size version of the always-excellent Bass Driver, so you can dial three different tones and save them onto the programmable footswitch. Handy if you enjoy a scungy growl on tap or if you switch basses on the fly. Also handy if you enjoy sounding good instead of sounding like garbage. 

Model: Tech 21 SansAmp Programmable Bass Driver DI
Made in: NYC USA, recent model
Type: analog amp modelling
Power: standard negative 9v power supply or battery (not included), also runs on phantom power
Equivalent new street price (approx): $449aud
Mods: velcro added
Accessories: no box or manual
Condition notes: used, no major marks. Overall: very good condition