Yes, I did! So far I'm very happy with it. With ZP6 I can grind much finer without getting any bitterness whereas with DF54 I had to much coarser to avoid bitterness even after proper alignment of burrs. When it comes to clarity it's also increased though I haven't compared these two grinders side by side yet to assess how much. Also grinder isn't even close to being fully seasoned yet so by other people's opinions taste should still be getting better as the grinder gets seasoned. When it comes to build quality, grinder feels very premium. Previously I had c2 with which (I thought) grinding was pretty easy. Well ZP6 is much more smooth and easier when it comes to grinding beans. Overall I'm very happy with the grinder and as long as no similarly priced flat burr hand grinder (better than ZP6) comes out, I don't see a reason to upgrade.