Running it here also and it's sweet. Got rid of the maf and there's 16 different tuning parameters. As stated earlier, WB fuel correction, shift light via SES adjustment, converter lock up adjustability just to mention a few.
Eric's 6.0 chip requires Powerlogger, and can use wb02 input. You still use the MAF with the 6.0. I have this one on order, having just gotten wb02 working. I would be interested to know if anyone has any track experience with this chip.
His most recent chip is the SD (speed density) chip and does not use the MAF. It requires Powerlogger and a 3-bar MAP. It can also use wb02 input.