The Anniversary P3ESR was slightly better than the standard version and popular, I did sell a few pairs. However, they were discontinued a few months ago and are to be replaced with the new P3ESR XD, which is an improvement on the Anniversary.
I now have the C7ES3 XD, M30.2 XD and SHL5+ XD here, and the P3ESR XD will be here next week. They will be available for order from next week.