MTM Chip and Accessories

I just bought my new 2002 A4 1.8T Quattro!!! So it is time to start working on her. Has anyone purchased any of the MTM chips, or upgraded to the K04 turbo? I was looking at starting off with the stage 1 chip from MTM and slowing adding components to work up to stage 3. Any feedback on these products would be amazing,
Cheers.