The 1U12LW is an intriguing bit of hardware. I have one on the bench but I got waylaid by the Elpida RAM issue, and lost several weeks trying to play "find the workable RAM."
Two primary concerns I have are that the power supply is under-spec in terms of watts, see comments in the review. ASRock's response was to show me the math for spinning drive power consumption, which wasn't much of an answer. I read it as "well, that's what we put in, sorry." The length and mounting bracket situation is also a little curious.
Still, I have been very impressed with the Avoton and the ASRock board overall. It would be an awesome selection for a nearline or backup ZFS storage server if one remediated the few issues. I intend to finish up with that review soon, but finding free time recently has been a bit of a challenge.