Yes, I used it last year in my hard ciders. I don't know if it made any difference, or not. I should have done a split batch, half with the MLF enzymes, and half without. I probably won't use it in the future. But, if I do, I would split a batch just to see what, if any, difference there might be.
On Deck - Several Hard Ciders
Primary - empty
Secondary - Hofbrauhaus Lager, Surly Furious clone, Kolsch
Bulk Aging - Brewtopia Barleywine, Pomegranate Wine, Red Table Wine, Wild Fox Grape Wine, Blueberry Wine