I am running an 020 on the front and a PR-II on the back right now due to an unplanned rear change last fall.
No problems but I am putting a PR II on the front next week.
FYI - The BS 020 is still availible, you just have to ask for the "OEM" tire. It is my understanding (you european types correct me if needed) that the EU spec is tire specific, not rating so the manufacturer must certify the bike with a specific tire and on the 13, the BS 020 is one of two certified as of now. The 021 is not certified under the EU spec.
Now the 020 U is discontinued...
Chris