Thought I'd briefly sum up my UD9 thoughts here if case anyone is interested.
First off, yeah it's significantly overpriced. If it were $30-$50 more than the classified 4 way it would be worth it but not at $624 or whatever it is now.
Full disclosure, my board isn't retail and has a few minor differences, mostly power connectors.
As to the secret bios issues, personally I don't believe in them. I have the E22 bios that Pro and Hicookie show off with, there isn't anything hugely special about it, in fact it's terrible for memory clocking, anything over ~1020 is unstable regardless of timings.
Yes, it is slightly more efficient for Super Pi and arguably PiFast, 95% of the difference seems to be the CPU microcode ignore thing which is available on the R3E now.
After about a few weeks on E22 I switched to retail bioses, F2-F4 and have been much happier since. It's a solid board all around, Bclk isn't at the same level as my E760 and there is a bit of latency from the NF200s but other than that, no real issues. Other thing worth mentioning is that it's a PITA to insulate, even with eraser.
It's replaced the E760 as my go to board when I want to test a chip if that says anything. Still there is no way I'd pay $624 for one, the difference just isn't there in my opinion.
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