I’ve just bought the very same wheels from a well known Dorset based bicycle shop (£299 – if that’s any use).
I wanted a lightweight wheelset that would take some abuse offorad but still take road tyre pressures.
I was also concerned about strength, but they’re the same weight rim as the Iron Cross CX rim, so strength should be similar. Stans recommend it as a CX rim for riders wanting to use std. road tyres as well. And the large owner of said Dorset based bicycle shop said he was getting on fine on his 24/28 iron cross wheelset. He’s got 30kgs on me, so I reckon I should be fine.
I’ve taken it down some rubbly paths and down a few steps (relatively gingerly, as I was on 28c GP4Seasons – thanks garmin connect!) No probs so far.