Its replication server is not as mature, but is improving. Great for datawarehousing and transaction processing, but, does not lend itself to VLDB use. Its support for SMP and speed makes it a great choice for more heavily used environments. Postgresql7 has really taken off as far as support and features. With the addition of multi database joins and a hot backup solution, it could contend with the likes of Oracle and Sybase.
Speed plagues it, still.
At some later date, we shall revisit the latest in opensource database for both SCO and Linux. Consider making a contribution to help pay for the costs of bringing it to you.