I'm fairly happy with my SATA150 TX4. I'm running a 36GB Raptor and two 160GB SATA drives through the card. I'd like to use another 160GB which is IDE, but I haven't had any luck with a SATA-to-IDE controller (Promise tech support has offered a solution that I have yet to try). I'm running six OSes off of my Raptor (four of which are Windows-based) and the remaining two are Linux and FreeBSD.
I *may* have gotten a little more support out-of-the-box with a different controller, but the Promise has not disappointed me at all.
-SUO