I guess that must be me.

But the point is, it was never working with the SIL drivers! None of the ports. The bundled driver was the first that enabled the ports. Unfortunately this driver does not work with SL properly, which results in kernel panics as soon as the connected drive is stressed.
I've got a little work to do at the moment, so I can't test it again before the end of January. But I will definitely keep you up to date!
I was wondering when you'd find your way into this thread.
Sorry about the confusion. I thought you had it working with the Beta drivers initially as well, not just the included driver in OS X.
BTW, what was the version of SL when you had functionality?
I'm wondering if it's an update to 10.6.2 that broke it, as the Beta drivers don't mention compatibility with 10.6.2, and if it failed under that one, still in testing, or just not updated (if passed in their testing).
I'd like to get this sorted, as many are wanting an inexpensive eSATA card, and the 4 port models are rather pricey. I do recall the card you have didn't work initially, as the existing drivers at the time (Leopard) failed. Then the Beta drivers dropped, and I was under the impression it was working from that point on.
If this isn't the case, or it's going to be yes, no, yes, no (drivers work then break with updates), it may be best to only recommend it to '06 - '08 owners. I hope this isn't the case, so I'm looking foward to getting a solution to this. $200USD is too much just to get a working eSATA port (and it won't even boot with OS X

).