They say that imitation is the sincerest form of flattery, but I see it as unmitigated flatulence. Scott, I can't tell you how many people have told me that their iteration of a Scuba Forum would be the death of ScubaBoard. Bwahahahaha! Somehow the imitations never seem to live up to the real thing.
Agreed in principle - and it's the right attitude on some level - but Scott should note that if this is an actionable violation of Zeagle's brand identity and trademark... failure to exert Zeagle's absolute right to protect their intellectual property will result in absolute loss of any legal protection of trademarks, copyright and valuable brand equity. Once that is eroded anyone can come out with a regulator, BCD or any scuba product and call it "Zeagle" with no possibility of Scott stopping them.
The fact that this vendor used to have a relationship with Zeagle and actually draws comparisons to Zeagle products is probably sufficient to establish a prima facie case of infringement.
I'm not one who yells "get a lawyer" anytime some looks at me cross-eyed, but this is a case where getting legal advice/intervention is a must.
Ray