It's great that it has multiple connectors to other databases like Oracle/SQL Server etc., which helps when you need more than one database in an analysis process or if there are issues connecting directly from RDBMSs (like MySQL).
I haven't found anything negative about this product so far; however sometimes connections can be slow due to network latency problems but overall performance seems good enough as well. If anyone wants any kind of integration between different types of sources then dremino could help them do just that! We've been using DreMinO since we started working together almost two years ago now and have not experienced many connectivity related errors nor bugs yet - although they say all software will experience some sort of malfunction sometime during its lifetime.