I've got two sets built up, some DT240 on Stans 340 disc rims, these are super light and tubeless up nicely as you'd expect, no braking surface and I've taken the decals off so they look pretty stealth, about 12 months old and are mostly my good weather/road wheels and some racing they stayed totally true.
Also have some Mavic open pro CD rims built onto XT hubs, these still look pretty cool as they don't look like they have a brake surface. About two years old and are my winter wheels and what I use for 3peaks CX training so get battered a lot, still nice and true, the rims are heavier than the stans but they are eyelet-ed and feel a bit more sturdy.
Stans are slightly wider, can't say I feel any difference where riding but they do give a nicer, rounder shape to the tyre, I am using Vittoria TNT tubeless and they do measure up slightly wider than they should.
I do fancy some pure road only for 28mm tyres, prob go for H plus son, they look cool, and have a similar shape to the stans, not too bothered about making them tubeless but I've heard others have done it no problem.