In order for any DIY wideband to be accurate, the most important part is the O2 sensor. It MUST be a good true wideband sensor.
I have not heard anything on it.
If anyone in the Houston area has one and wants to compare it to "our group's UEGO wideband", we are willing to do it for a fee. Since we can insert ours into the tailpipe, it will not interfere with the stock O2 sensor.
Have owned my FD since June 1992.