for my second iteration of this... it seems IE or my computer in general ate my first post.

I had a VX O2 sensor that I bought for my '92 VX. It had ~12k miles on it before I did my swap, I purchased it new from a local honda stealership. So I trust that it was good.

I talked a local tuner shop into hooking up their UEGO wideband and my VX O2(circuit used is from that same site, hooked to a fluke 87 multimeter on the rapid response mode) in my car and we went for a run.
it seemed that the lower the voltage it gave us the more the table on the site was off as far as A/F ratio. He also mentioned that the reading seemed to be a little slower, but I didn’t notice any difference in reading speed.

Maybe the table is off, maybe my O2 was actually messed up. I don’t know for sure. But from what I’ve seen of it, it would be fine for getting you close enough to be able to run for a while if you can’t get to a dyno or tuner… but it’s not accurate enough for me, or for me to recommend to anyone for a final tune.