My teacher thought I sounded scratchy when using it. There was an unwanted grit in the sound. It wasn't my bow technique either, because it was there even when the strings were speaking in full voice and the bow was in the groove. I stopped using it. I switched around a bit: Kolstein soft, Leatherwood, back to my old favorite of Carlsson, and finally went to Pops and I think that's just the thing. A tiny bit when practicing at home and a healthy swipe before rehearsals, and I clean it off my bass and strings every day.
Are you referring to Bernadel cello rosin? My daughter has a cake of that, I'll maybe look at it, but it's hard to imagine getting any grip from it.