I have Halo Vapour GXC in both 700c & 650b (tour version with 36spokes) and so far they've been faultless. 3 or 4 different tyres have all setup tubeless with ease and hold air well when not in use for weeks/months at a time.
When the 650b are on it gets used like a mtb and they're still solid and true. It was between these and some Hope XC/Gravel wheels and the Halos edged it as I prefered the finish and rim profile, no regrets so far.
If you like a quiet freehub these wont' be for you though!