This rosin is magical. Better than anything else I've ever tried.
The A Piacere cello rosin follows the old Tartini Green recipe, which had a stellar reputation and a notorious following. As far as I can tell, this reincarnation is exactly the same as the old recipe. When news that it would be discontinued came out back in the day, a considerable number of cellists bought the Tartini Green it in bulk. This speaks volumes of how good the quality is/was.
This rosin grips better than any other that I've tried, yet it's still very smooth and fluid. The sound is considerably improved whenever I hear someone try it out for the first time.