I have been following this thread with interest, too.
If the photo posted by the OP reflects the actual color difference between the two drivers (and isn't mainly an artifact of uneven lighting, as someone else pointed out) then, sure, I'd be unhappy, too, and I'd want a solution from the manufacturer.
If the manufacturer's offer to exchange the speakers included return shipping, then I think that's a reasonable solution. I certainly don't think the customer should be on the hook for something the manufacturer got wrong.
I don't think that being a small or "boutique" manufacturer should be an excuse for less than perfect QC. For that matter, even if you're Wilson and the automotive paint job on your speakers cracks with age (read about that somewhere) you need to take responsibility for that.
Furthermore, if I went the grille route and got a set with pegs for a "pegless" cabinet, I'd be pretty steamed... this kind of aggravation tends to be cumulative - that's a pretty human response. And all the more so if communication's been sluggish.
That said, once somebody takes to flaming a company in a public forum looking for support for their anger, I start to wonder if they're being reasonable. Once you get over the "but it should have been perfect" indignation, you're either willing to work toward with the manufacturer toward a solution or you're not.
I have never had dealings of any kind with Tekton, but it seems they've flourished for a long time, so I'd think/hope this kind of shoddy QC is a fluke...
