I purchased a 3 axis 425oz hybrid stepper setup with a B.O.B. and have had great success with it. I did smoke a driver, my fault, and Jolie at Wantai
sent me another one at cost. I upgraded from a TB6560 at 24vdc to the hybrid stepper drivers and 36vdc on a CNC router table. The upgrade was amazing to say the least. I think these stepper drivers and motors are exactly the same as Keling systems with a different sticker on them. Go ahead and get the system from Wantai and tell Jolie that Pete sent you.
Here's Jolie's email address: email@example.com if you want to get a price on something.
Have a good one.