Are these sensors any better than a stock O2 sensor that has been linearized into the wide number range? I was thinking about getting one to help tune my PFC, but didn't know if it was any more reliable as far as data gained from it than my stock O2 sensor readings.

If true wideband can let you safely tune your car to a reasonable safety level and accuracy of say 95% and the stock O2 sensor is at the other end and you can only tune with it to a level of safety and accuracy of say 60%, where does the Greddy O2 sensor land inbetween those 2 ranges?
I want to be able to tune with the Greddy unit only if its more accurate thant he stock sensor, but not TRY to tune with it like it was a true wideband.
Tim Benton