I must say I was a sceptic about buying the GQ-4X i owned an old williem universal that plugged into parrallel port and it worked great for the times but i have just used my new programmer to read sucessfully a 93C66 16 bit chip on board with no soldering thats a plus and i wrote the file to a different 93C66 without un soldering the chip and it worked perfect i am so happy with my new toy A BIG Thank You to its creator one happy customer here!!! After spending $600.00 for a Tacho Pro Mileage corrector from china that never worked and i use it for a door stop who would have thought this item a fraction of its price works sooooo gooood!!!