I am really happy with the quality of my Light Bicycle U45 rims. Those obviously aren't shallow, but they have 29er MTB rims that might fit the bill. (My rims weighed 450g/pc so pretty light for wide rims.) Quality of the carbon finish, smoothness of bead/bed was all very nice. The ERD on both rims was identical and matched claimed numbers. The weights of each were within 2g of each other (and claimed). They seemed to be much better-built (at least the aspects one can see) than the Farsports clinchers I had previously. They also claim to be tubeless ready, though I have not tested that yet.
I just bought the rims and built the wheels; I had a poor experience with build quality from Farsports (I had to rebuild those wheels), so decided to build myself -- though that is not cheaper. I also wanted to use a front hub they did not have available -- the Novatec XD711 hub that is convertible to 15mm thru-axle (and 9mm thru-axle, which is what I am running now).
Anyway, very happy with these wheels. I have only ridden these ~1800 miles, buy they have sustained a lot of abuse (potholes, gravel, a crash a couple weeks ago) without flinching.
Pretty much my thoughts on my 45mm LB disc rims! Also bought the rims separately and got them built up on Hope hubs by a local wheel builder - about 1300 miles so far, over some quite rough roads at times, and no problems whatsoever. Really impressed! I'm running them tubeless too, which also works fine.