I think Durr used to be best german libero until 2 years ago. She was better than Tzscherlich, who's to be one of the weakest main libero among all NTs. But when Bujs came to Schwerin she improved so damnly! I remember her match against Villa Cortese, she was a dig machine! She is even so stable receiver. Durr is not that young right now (she's 23), when you can find 18 years players on international level, so she was impressive until some years ago, but now Thomsen is far away better. No doubt. It looks like Durr's level is alway the same, while Thomsen's one is rising up so quickly.
Are you kidding me? Just towards the very end of her career when her bad knee harmed her a lot she was bad, but whenever I get to watch old matches of German NT I realise how good Tzscherlich has really been. She hasn't been one of the spectacular liberos, but an incredibly solid receiver and also defender.