I know this is an old thread but I thought some things perhaps needed clearing up.. First of all, saying whether one is genuine or not is like asking which came first, the chicken or the egg... As far as patents go, NRG has one (7,527,293); however, a patent on something like that is also relative. You can change a product enough to get a new patent. If people actually research the stuff they post, you will find that Lee H. Dahmer was one of the first with the patent # 6,971,675 for a quick release. As far as market wise, it's most likely due to the lower price of NRG's quick releases that they are more popular. I can't say anything in regards to Works Bell quality because I've never compared them side by side. I wouldn't doubt that Works Bell is probably better made seeing as NRG's are made in China/Taiwan whereas I would assume that Works Bell is made in Japan.. but then again, that's speculation...
Also, if NRG was THAT bad, why would it be featured in the Nissan 370Z in Fast Five? They use an NRG Hub Adapter, Steering Wheel, AND Quick Release... I have dealt with NRG on many occasions and haven't really found any problems with them.. I suppose it's each to their own. Every company has a bad egg, I guess some are just unlucky to be the one that gets it..
http://www.crowdersllc.com/2013/12/nrg-products-featured-in-fast-five/