I received this pedal as a gift, and upon trying it out I was somewhat disappointed in that it is not a very good overdrive from the factory, very little if any dirt.
I did do some research and found Joshua @ FXDoctor. I explained the situation and he was confident he could modify the pedal to have a similar gain quality to the ts9, and he sure did. The pedal is much better, I would describe the drive as a politer version of the Microtubes.
Long and short of it is if you can find one of these for like $50 or so buy it and send it to FXDoctor. You will be glad you did.
Ibanez TS9B Bass Tube Screamer