These cards work fine. They work well. These cards actually have a lot more features than even the newest Adaptec SCSI RAID conrollers. I think they might even have native Windows 2000 drivers. These cards aren't that uncommon in servers. The best way to find out about it's features is to just plug it in and play with it.
As to price, I'm selling a Netraid 1si, almost the exact same card, for $175 with no takers. Someone sold a 1si in about 10 minutes at $135 though.