The nice thing is that yes, you can administer DB2, Oracle, and SQL Server (which we do here) all via the same interface. What I LOVE about DBArtisian is that you can run reports on any object quickly and see information that is difficult if not impossible to find in Ent. Manager (SQLSvr). Like, space used by data vs. indexes by table in mb via a pie graph. A easily printable document of any object... table report gives you space used/unused, row counts, col names, indexes, SPs used by the table and the DDL for the table. Via the GUI you can reindex a tables indexes quickly, run update stats on specific objects easily... order the tables by least amount of rows, most # of rows.... (that is great because my boss is always asking, which tables are the biggest now ?). This is also a little better than the Ent. Manager in Oracle too.
Granted, if you don't have the extra cash to purchase this product you can get by easily with Ent. manager just fine, I agree, however, if you can justify it is very nice to have.