USB3.0 enclosure won't spin down when ejected or when Mac sleeps

Hi,
I just purchased two different USB3.0 2.5'' SATA enclosures to replace USB2.0 enclosures that I currently use.
In both cases, the drive I have inserted has refused to spin down when the drive was ejected, or when the Mac it was attached to went to sleep. I have never had this issue with USB2.0, FireWire400, FireWire800 or eSATA drives attached to these Macs.
I've used the USB3.0 enclosures on two different Macs, one a Mac Pro, the other a MacBook Pro. One runs Mountain Lion, the other Mavericks. Both only have USB2.0 ports.*
Is this a noted bug with USB3.0 drives being used on USB2.0 ports? I can't find any evidence that it is.
Comments on this would be welcomed, because otherwise I can see myself trawling through Amazon's range of USB3.0 enclosures until I find one that works properly - probably the most expensive
* The Mac Pro will shortly have a PCIe USB3.0 card, hence the enclosures, but this won't help matters on my MBP.

Received the PCIe USB 3.0 card today and was able to test the enclosures with it. In this case, the drive still fails to spin down when ejected. So, it's not a USB 2.0/3.0 incompatibility. The manufacturer advised a firmware update on the enclosure, but this didn't fix the issue.
The enclosure did spin down when the USB 3.0-equipped Mac slept, but when I woke the Mac it re-mounted a previously unmounted volume on the device, so I suspect this was more a case of the PCIe card simply entirely losing connection with the drive on sleep, and re-recognising if on wake. This tallies with information I've read regarding the odd and unpredictable performance of USB 3.0 on older Macs.

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USB3.0 enclosure won't spin down when ejected or when Mac sleeps

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