Done a bit of research on this. If you google the thing as the last person recommended you get bit of a mixed bag. Some for some against.
I run a 300 Tdi and on the balance have decided to leave well alone, change the belt well within the recommended interval and keep an eye out for any nasty black belt bit in between.
Belt failure is not so much of an issue in the 200's, so my advice would be to avoid the kit, they cost mega bucks anyway and if there is any cause for doubt in the design you could be trashin a perfectly good engine.