Matt Adamswrote a review of Mercury Wheels M1 Disc Brake Wheelset - Clincher on March 16, 2018
Familiarity: I've put it through the wringer
You really can't beat these for the price. I got these as a second set for my gravel bike to more easily switch from 40c knobbies to 28c road slicks.
I'm running these wheels tubeless with 40c WTB nanos in the rear and 40c Maxis Ravager in the front somewhere around 35-40 psi and they are great! So great in fact that I'm getting a second pair for my 28c Conti gatorskins (not tubeless, unfortunately).
The wheels are light, run true, and have a descent "buzz" sound from the freewheel (not Chris King great, but better than the stock Niner wheels that came on my RLT 9 steel 2-star build).
The only issue with running these tubeless is you might need a better rim tape. I had my LBS set them up tubeless for me, and they had to replace one rim tape, but were able to use the other. Since I had it done for me, I can't personally speak to how easy or difficult they are to set up, but they've held air pressure VERY well since getting them set up.