I've gone from a 960XPM to a Warrior R1 Pro to a NME ONE. I loved the 960XMP but yeah I sweat a ton and that probably got 1lb heavier at the end of a skate, weight aside it's the safest I've felt in a helmet. The R1 Pro I like but the thinner and stiffer forehead foam bothers me a bit, I like to know there's a bit more travel between me and an impact. The chin is also a tad wider which can effect glancing over the shoulder, at least with my big RX3 Pro+ CA. I still have it as office decor and backup if/when needed.
The NME feels like a great balance between the 960 and the older NME. Cheeks have soft cushion which is nice but its not so thick that it turns into a space age squeegee, forehead foam is similar to the older NME with some softer where the sweat band is + a ridge which makes space for the sweat band and also creates a comfortable gap. If I could change anything on it I'd maybe replace the forehead area with 960 foam but otherwise its super light, breaths extremely well and instills confidence.
The chin vents are pretty big so I guess you could say another downside would be possible paint/design limitations now the jaw?