This time it's personal........
hahaha
Anyway, I've read a lot of good, sensible points of view on this matter (as well as some really stupid, closed-minded ones, not pointing any fingers, though, these people are on both sides of the issue), and i've come to the conclusion that it isn't so black and white.
On one hand, the Spyderhole has been used more or less exclusively in Spyderco knives for over twenty years, and I feel that it really is the single most defining trait of their knives, and a knife with a single large hole really does scream Spyderco. When I saw the Vex, I was genuinely confused for a moment, as I am when I see any knife that isn't Spyderco using the hole. I feel that, being the inventor of the Spyderhole, as well and the pioneer of one handed operating knives all together, Sal deserves to be recognized when it is used, and it deserves to be referred to as the Spyderhole. People that downplay this are being petty and lack appreciation for the history of tactical folding knives. "It's just a circle"

Please, grow up. In this aspect, I definitely understand how the hole can be trademarked, as it does, in fact, serve the purpose of a trademark. People who know knives, think Spyderco when they see the hole. It's not that simple, however.
On the other hand, I definitely see where Hardheart is coming from as well. I feel that he has best highlighted the issues with the trademark. I also find it odd that something that has been pateneted for it's 20 year stint can immeditaly be trademarked. It does kind of defeat the purpose of the patent time limit. While I do think that other openers do work just as well as the Spyderhole, I also think that nothing works quite like the Spyderhole, either. Many feel that it is the best way to open a knife, so it seems odd that only one company can use it. Like somebody mentioned, custom makers desire to use the hole for a reason.
In conclusion, I think the hole is a bit unique in it's situation. I think that Sal and Spyderco deserve credit for the hole, and if another company uses it, it should, at the very least, be referred to as a Spyderhole, out of respect and appreciation for Sal's innovation. He invented the hole in this form, so at least call it what it is. I also think that, if BM really is trying to challenge Spyderco's trademark, they are doing it in a disrespectful and foul manner. I would not have any problem with them or anybody else challenging the trademark, as I do believe there is a good case for both sides, and I honestly wouldn't mind seeing the hole used on other brands as long as credit is given. I really wish there was some official info on how the Vex came about and the intention behind it, as well as any communication between the companies. As it appears, however, the hole is stolen on the Vex, as, whether the trademark is debatable or not, it is in effect. That being said, I won't support that particular knife. I'm not boycotting BM by any means, though. I think they bring a lot to the table, and appreciate them as a company overall.