Our feature set is generally considered to be very competitive with other leading SQL RDBMSes. Certainly there are features some of them have which we don't, and the reverse is also true. To date, only a few benchmarks have been published showing PostgreSQL to be within 10-30% of proprietary competitors. However, we have had many users migrate from other database systems – primarily Oracle and Informix – and they are completely satisfied with the performance of their PostgreSQL systems.