Vintage King has garnered an increasingly good reputation in its dealings with buyers of vintage mics over the last decade. They are expensive, in my opinion, and not staffed by particularly deep mic experts, especially when it comes to authenticating a vintage mic down to its last screw or wire. But that would be unrealistic to ask for; the field of vintage mics is too specialized to allow for a generalist pro-audio dealer to develop deep detail knowledge. And VK makes up for that with a generous warranty.
That is to me the crucial point when evaluating whether a company is suitable for me to engage with: how do they act and behave when there are "issues", when the buyer is unhappy?
And there, I have found VK to be flawless, whenever any type of complaint from a buyer arose. (I usually hear from buyers and their buying experience once I provide service, and I love to understand what makes a happy customer, and what makes for a good outcome for buyer and seller when problems arise.)
In my recollection, there have been few lasting gripes from buyers about VK. The company took care of the issues, if need be, all the way to refunding the purchase price. Mike Nehra is a veteran in the vintage mic selling business, and runs a tight ship. He seems to instill in his employees an understanding how tight-knit our recording community is, and how damaging to his company's reputation even a small slip-up can be.
My opinion of Vintage King is based on my personal experience over the years with VK staff, and with buyer of VK's vintage mics. I do not receive kickbacks, commissions, or any other kind of favors, nor do I have a business affiliation with Vintage King. My interaction with the company is limited to the occasional mic a buyer sends me for authentication after a purchase. In all cases where I found flaws, or had concerns, VK took care of them to the buyer's satisfaction.