I've got one now, and it works OK - but if I had the option of doing it over again, I'd probably go with a different company, like Epox. My chaintech, at least, has a few "quirks" to work around:
1) with 2 512MB PC3200 sticks of RAM plugged in, I can NOT get the board to run at a 1:1 ratio. It defaults to 5:6, which runs the CPU at full speed but the memory at PC2700. I have yet to find a way to force the board to run at 1:1, so right now I'm just OCing a little to run the memory at full speed.
2) The temperature readings on this board are out of whack: Min consistently shows a temp close to 50c, whether the computer has been idling or going full blast - playing games, encoding video, running SETI, you name it. A friend of mine, with the same CPU and RAM, used an Epox board to build his computer, and his tems are in the high thirties, occasionally hitting 40c or so.
3) Every once in a while the thing fails to boot - it beeps and appears to go through post, but I get no video signal on the screen (which may also mean it's my video card, but since I've had 3 different cards in here at various times, I doubt it). All I have to do is hold the power button in until the thing shuts down, and boot it again, and it comes up fine.
EDIT: I should add that I have an NF3-based VNF3-250, not an NF4 board.
Nate