I have mine last december. i really love it. it cuts off a lot of problems in the past. Like mobility, loops, and clearer notes because of speed reduction.
I'm not quite sure of the bass reduction, it seems less to no effect at all.
totally the trainer is a very useful tool.
Tascam Cd-bt1 Bass Trainer
The new CD-BT1 is the ultimate portable workshop and jamming tool for bass guitar.