First off all, I think it will be a good idea to always mention Trainer Type when reporting PowerMatch results. I refuse to believe that all trainers will respond the same way…
So here’s my first test on a Tacx Vortex;
My experience was totaly different because I was blown away by how good it works. At the start of the workout I’m usualy 20-25w too high because everything is still cold. Powermatch adjusted 21w down after 20sec. Then the corrections became gradually lower because trainer and tire got to temperature. After about 12min I had Powermatch at +/- 4w for the rest of the workout. Ended up with an almost perfect fit to target. Only the first 20 sec were off and that is totaly acceptable. This is off course an endurance ride at steady state and I will need to test some intervals to see how it behaves there. I’m very happy with this result for a first beta release!
The difference I see with Jeremy’s setup, is that in this zone my trainer is, once warmed-up, very close to my PowerMeter and corrections are small.
At first Alex was talking about 5% tolerance but for me it tracks within 1% 
Actually Powermatch did automatically what I have been doing manualy for some time now by adjusting the intensity. All temperature drift is nicely removed.
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