sata port multiplier recommendations?

[Dieter BSD]

I have a couple of the SII3726 sata port multipliers, and they
have been working fairly well, but one of them appears to be dying fast.
Looking around, I see that they are finally making PMs that claim
to do sata-3 speeds.  Do any of these work well with BSD?  Any to
avoid?  Is it safe to assume that they work ok with sata-2 controllers?
(until I get a newer faster controller)  Needs to support NCQ, hotplug,
FIS, ...