Yeah, I'm not convinced by that article; it says they've tested the power gains, and there's results for it... but no more details (like how many runs they did).
I appreciate that it's definitely the best filtering, and if there is no vacuum drop across it that has to be the best filter.
I'm disputing the science of what they've done rather than your decision!
I guess what I'm saying is that I don't believe there's much difference between any of them; they all stopped using really sticky oils when they realised it upset the AFM. An improvement of 1bhp over the other filters is not statistically valid (nor has it been shown to be significant) because you can get more than that between runs on the rolling road. - There is no evidence of experimental design, and it's the kind of pseudo-science that Myth Busters would do (and as an analytical chemist I can't let go of this kind of thing - you should hear me lay into CSI).
I guess if they are all the same price (as the article suggests), go with the A'Pexi... if they're not pick what you like because it doesn't really make that much difference. (It is hard to dispute that filtration test though.)