Carbon Beams i've had have been solid. Wouldn't recommend for AM/Enduro use though, and they don't really seem to make rims aimed at AM/Enduro. The DH versions I bought have so far been bombproof and immensely stiff, but also weigh 600g each so not exactly a weight saving.
Probably worth looking at Nextie/LB too, will likely end up being about the same cost, or near enough to.
Smarter Shopping, Better Living! Aliexpress.com
www.aliexpress.com
Smarter Shopping, Better Living! Aliexpress.com
www.aliexpress.com
[Premium] 29" Asymmetric MTB Rim 35mm
www.nextie.com
The AM/EN933 29" mtb wheels are built for downhill/enduro bikes to win races or devour bike park trails. Ride fast and confident on steep and technical trails.
www.lightbicycle.com