I got a few of these adaprters.
They are spot on
I got mine purely for use in my Atari Falcon. For a PC they are a tad slow to be honest, thats not to say that they are slow to use, because they are not... The Falcon accesses its Hard Disks a lot slower than a PC, so for the Falcon, it was better than the real thing, plus of course the extra handyness of the size.
I have both Dual and Single adapters. The dual adapter does not seem to workon the Atari, not that it matters as I use it only for my C: with my SCSI SCSI Drives for the rest of the HDs.
On the PC, I used a 1GB and a 4GB Card in one adapter, and run NT4 for a few weeks to try it out and it ran fairly sweet... The PC I had it in was a K6/2 500 and to be honest, a laptop would be fine, but for a desktop, it will feel a tad slow.
Erm, what else?
Well, I have also tried a pair of 4GB Cards in a pair of adapters on an SIL0680 PCI card and set them up as RAID... Bit silly I know, but also a bit of fun too!
I cannot remember the results, nor can I find them, but I know I have them saved... I gained about a 60% speed increase IIRC, but at the time, setting them up as an 8GB Raid array purely for a C: was a little expensive and it was still slower than a real HD, so I never kept it.
Anyway, either way, they work and they work very well to be fair.
Oh, one other thing...
The adapters I have are all offering different advantages...
A couple of the dual adapters for example, allow me to add a pair of 4GB Cards and I get one 8GB Drive... Sort of making its own RAID in a way... Other dual cards will give me the 2x4GB Drives.
They can all be set as Master or Slave by way of a jumper.