I have had some for 3 months, after my bike with XMC1200s was stolen.
The 1200s were ok. The flat spokes were a bit noisy in a car park test, and were prone to damage. I had them 3 years.
I went for the 1501s this time around because the 1200s were quite a bit more expensive, and the weight difference isn’t that big. I think the only difference is the spokes, but it’s hard to confirm which rims you get with these wheels.
General performance has been fine, but a couple of weeks ago I cracked a rim. This wasn’t down to a faulty or weak part, just a combination of exo tyre, no insert, too little pressure, and a big whack. It was a hit enough to snakebite the tyre, and both holes needed two salamis to repair. It was a small crack and I used the wheel on chunky trails for another 2 weeks, albeit with a DH casing tyre and slightly higher than normal pressure.
I returned the wheel to DT for repair. For 250chf they are replacing the rim, rebuilding with new spokes, and servicing the hub. That’s about what I’d have to pay for the rim only if I bought one from China, and that would be a heavier rim, so I think whilst it’s not a free replacement I think it’s actually a good deal.