One of our editors at VWvortex has the chip on his Golf, and from what I hear, it's pretty good. That is pretty much all I know, though you may also want to consider IPD and the Garrett Chip from PES as well.
Honestly I would trust the IPD ECU over many others. They will be around to support you as well as have the experience. You may pay a little more now, but it may be worth it in the long run. <P>Prospero