There is no de-soldering of the chip. The instructions come from Powerchip for removing the entire ECU. In front of the Passenger side at the Firewall is the long black fuse console which has the wire harnesses and the ECU unit. Unplug the 5 wire harnesses from the unit and push 2 clips aside and the unit slides right up out of the holder.
I spoke with 2 people at Powerchip and they stated that the performance increase was noticeable (especially with the 93 octane). I will give you an honest opinion as I have taken the average acceleration time for my car over 10 consecutive starts from 0 - 60 (close to 7.1 seconds was the average). Best time was right around 6.7. I will go through the same routine after the ECU is returned and give everyone an honest opinion. If it is NOT noticeable....it is going back.
Powerchip also states that the modifications are invisible to the dealer.