Kevin C.wrote a review of Mercury Wheels M5 Clincher Wheelset on August 18, 2016
Familiarity: I've put it through the wringer
I've been using these as my everyday/groups wheel and race wheel and they are great. They really come alive when you get up to speed and I'd recommend them to anyone. Parts are from over seas but wheels are hand built in Utah so I don't think quality control is an issue. They've seemed to stay true over the past few months I've run them. I like them more than the Mavic ksryium SLRs & 2009 zipp 404s I've owned in the past ( hubs aren't as good but I will be replacing the novatecs with tunes in the future). Wheel profile is great, similar width and design to ENVE.
My only suggestion would be to buy quality brake pads at the time of purchase. The braking is manageable if you have adequate time to stop, but on steep descents with tight corners, stop signs or red lights these pads are LOUD and get HOT quick. Gets fairly embarrassing when everyone smells your burning brake pads and hears your ear piercing tires squeak. I'll be getting some swiss stop black princess and I'll report back on those.