The ZMF lambskin pads are great. Good quality, and premium feeling. I find that they add some body and a tiny hint of warmth to the sound. With all stickers removed, 8XX had much better clarity, but sounded thin. The pads brought a welcome change and balance. Only downside with the new pads is that it feels a bit heavier in the hand and on the head.
While I did like the stock sound profile with stock pads and stickers in place, it sounded a bit congested and "veiled". Vocals sounded nasally and the stickers were holding back on clarity and detail retrieval. With stickers on, they sound more like a mid $300-500 range headphone. With sticker mod, now they sound like a proper $1000+ flagship headphone.