I installed stage 1 Bluefin on my GTI DSG tonight, cost me £230 to get the device reprogrammed from my previous car (non-VW).
Only takes 5 mins to install. I couldn't tell much difference to start with and was a bit disappointed, so I reinstalled the old map (takes 5 mins again), and suddenly you can tell the difference in power. As someone mentioned on here, it really flies from 4k, but I was hoping to notice the difference from 2k upwards, as per the graph on their website. So yes, it looks fudged.
Other observations? The engine management light was on the 1st time I fired it up (with either map), so turned it off & on again, and both times the light went off & stayed off.
Up to 3k it doesn't feel much different, but after that it's more rapid and from 4k it really flies. A few times I did notice a slight hesitation / flat spot between 3k-4k, so I'll email Superchips tomorrow and check I have the right map.
In summary, it's certainly quicker but with the flat spots and the power not being where i expected it, the jury is still out. I'll give it a few days as I always find installing a remap to be an anti-climax!