I’m running ARC30s on Pro4s, brass nipples and DB spokes. from CR, came in at about £420 IIRC.
A year in and they’re still running perfectly. I think they came in around 1800g or so when I weighed them, so not the lightest, but they’ve put up with a lot of abuse. I do only weigh 10st though.
TBH I would have got the Flow MK3s if they were available when I bought the wheels, but they weren’t, and I have no regrets. Regularly running around 18PSI over rough and rooty stuff and there’s no damage at all. However, I haven’t pushed them on much rocky stuff.
They’re just the right level of stiff for me as well – really nice in the corners but seem to have a smidge of lateral compliancy as well.