Have a set of Xero XR1s. Cracks in the rim at the spoke holes on the rear driveside at about 10,000 mi. Replaced with Neuvation R28 Areo4s. Really like them so far with 2k mi, leave everybody in my group in the dust on downhills! I am heavy at 195 lbs.

Read this here and it is worth repeating. Light wheels, we want light, cheap, reliable. Choose ANY 2.
The XR1s were cheap and light, and not reliable for me.