don't do it, difficult to chip, camchain prone to failure which takes hpfp with it, and ihi turbo that fails a lot
I've heard mixed reports on the TSI/EA888.
A friend in the business (VAG contractor) says the EA888 is not a patch on the older EA113 engines (AXX & BYD respectively) which is massively over engineered as we already know. The TSI is a lot cheaper to build and is therefore not as bomb proof. I also remember JonnyC mentioning that VWR have blown a few up too.
But, conversely, I have seen in one of the VW magazines that the TSI responds very well to tuning and (apparently) quite safely.
danish is right though, the chain driven cams are certainly not as infallible as people seem to think. I stand to be corrected, but AFAIK, the GTI EA888 variant still uses a K03, its Skodas that have the IHI unit.