I'm neither a customer or related party, but, in my humble medium, knifecenter has definitely put in its work as a online vendor establishing it's standing as a medium, or one standard, in the industry by which to compare with any other. Like Amazon with everything else, knifecenter is a good starting point of reference. Won't find this data on Amazon, I can tell you.
Can't say anything about the customer support, which I say is important, knifecenter does do the math, putting out the available knives, future products, details and as mentioned, reviews by way of videos. Sure, there are a lot of reviews by many aficionados, but how many from large sellers, aside from BladeHQ, the other large presence and they do make themselves known and available, as they should.
I guess I'm saying it's as legit as a business model as it can get for a vendor. Just imagine how much better then can be, profitability, if CS had been pleasant.