Yeah, my Wideband sensor (LC1) is plenty responsive enough.
My software is actually capable of displaying both my Innovate LC-1 output (through the Serial port), as well as the output from the OEM ECU.
As for how I used the ECU value, the SSM protocol provides an actual Lambda value. From there, it's easy to convert to an Air/Fuel ratio, provided you know the type of fuel. I'm not using the Voltage output from the OEM one, only the ECU Provided Lambda value.