alcyppa
Inspired
Well, I can only really speak to my perspective (obviously). I'm not really that interested in authenticity of the IR as much as how well it works sonically for my needs. Getting subjective impressions from those who have used various third party sellers was all I was looking for.
I imagine there are folks who are looking for an accurate emulation of a real world product, this just isn't me.
Personally I choose the IR vendor based upon the "ears" of whom is doing the captures.
I find to be ear fatiguing cycling through countless IRs that represent every single mic placement around the cone so I'd rather have a handful of files to choose from.
And for doing that I'd have to trust who's responsible for them, like paying for a sound engineer whos work best represents what I like in guitar tones.