At this point the extension is still quite young and is missing some key features like spatial indexing and support for well known binary. By trying it out and providing us with feedback you can help drive development of these features.
The extension is based on the recent re-architecture in GeoTools for database backed data stores. Code named “JDBC Next Generation”, it provides a framework for building new data store implementations quickly and robustly. Also based on this architecture are soon to come improved extensions for MySQL, Oracle, and DB2. A new extension for SpatiaLite is also in the works.