I recently took a tour of Wright's factory and what stood out to me was they have everything done in-house. They make their own dies, they dropforge, heat treat, chrome, everything. Most tool manufacturers do some of that, but then have to ship it around the country for the rest of those steps. For instance, SK didn't chrome anything, and I don't have to tell you the problems they've had with making stuff.
Controlling all parts of manufacturing is also helpful when you're trying to perfect the processes that go into your tools. When I was touring the plant, they were talking about how they've changed their chroming process just slightly and are excited because they think the chrome has never been better. You don't get this when you farm this step out to a third party.
Anyway, they've been a great company to deal with all these years, but this is coming from a Wright Distributor so I'm not exactly unbiased.