I'm in love!
The first thing to say about them, apart from how comfortable they are, is that they are very, very responsive. They seem to spring and propel you forward, nothing is lost in energy terms. They are super lightweight too. Although my first run in them was short, they had plenty of different terrain to test them. They are a tiny bit slippy on wet pavement and tarmac, but no more than any other running shoes I've worn. I went along muddy footpaths that morphed into stretches that were paved in largish stones, none of which got caught in the soles, then rocky farm tracks, then very wet grass across rough fields where the going was extremely holey and uneven.
A longer run is needed to really test these shoes, but so far I think these are probably the most peppy, snappy shoes of my four pairs of Ons and could be used for fast road work just as much as trails.
And they're orange!!!