Dell Inspiron 6400 is a very reliable laptop in terms of performance and maintenance. The service provided by Dell is one positive point which you should keep in mind when you buy this. The security part is very well taken care of with IOS passwords and port disablement features. The integrated smart card reader provides a strong user authentication and there is also a finger print reader which makes it a very secure laptop. With a decent 4 hour battery back up, 4 GB RAM and a core duo processor makes it supportive of multi tasking with programs. The design is very good and is very robust with a wide screen.