For: Ease of deployment, compactness.
Against: The cost may be a little high for some organizations.
Verdict: A comprehensive and easily managed network access control solution in a box.

It is compatible with a wide range of network devices, and switches and should be easily deployed in the majority of cases, having very little impact upon network performance. Once installed, it can enforce policy at group or individual level, targeting specific devices, ports or users if need be.
The product is compatible with various authentication philosophies and, indeed, can operate in a mixed authentication mode environment if required. Similarly, it can integrate with various directory services via LDAP, providing flexibility of configuration.
The Lockdown Enforcer can also perform basic vulnerability scanning in order to identify potential weaknesses on your network. This can function with or without the help of remote agents, and remediation may be manual or automated. As you might expect, there is also a custom reports facility that offers several basic report types for customisation.
This is a lot of functionality for one box. In fact, Lockdown Networks offers some companion products that make the Enforcer concept especially scalable. These include the Lockdown Sentry, which works with the Enforcer to extend the functionality to remote sites; and, for the larger enterprise, the Lockdown Commander, which provides a centralised management function for multiple Lockdown Enforcers.
Lockdown Networks is still a fairly young company, but clearly has built up a very well-considered product portfolio with which to provide straightforward but effective network access control. Medium-sized enterprises in particular would benefit from this virtual "plug and play" approach, providing comprehensive protection with manageable levels of administration and support.