Love my Ons!
I've just hit 200 miles in my Cloudflyers and I still absolutely love them. These are my first pair of Ons and previously I had run 300 miles in a pair of Adidas Supernovas with no issue so was unsure whether to change. I definitely made the right decision to switch as again, I have had no issues and I still remember feeling the difference in weight when I took them out of my first run. They are so light it almost feels like you are running barefoot.
They don't look like they will be very grippy from the pictures but I've had no issues running on roads, compacted trails and the odd off road diversion (Canal towpaths/farmers fields etc). I've run everything from 5k to half marathon distance in them and can't fault them.
The only thing I would change is the price but when I come to replace my current Cloudflyers, I doubt i'll choose anything else.