I got it simulated in B2spice too!
although it only has the MAX4252 opamp instead.
It works really well, and I was able to use it in low side, and high side current measurements.

Now where do I get these in the states?

(edited: just figured out as a noob how to order the pcbs for this from the gerber files given from the ucurrent home page.

2 boards were 90 bucks)