You can also set a password on Sphinx to prevent configuration changes. For this reason, it's a good product for network administrators to deploy as they can set up Sphinx on a workstation, password-protect it, then send the log files to a centralised computer for analysis. Profiles can be implemented so that each user can have a different level of security. There's a multitude of configuration options available in Sphinx, which might be overwhelming for the inexperienced. There are wizards available for some operations, but not everything is covered.
Documentation is nearly non-existant and what is provided is very sketchy and missing in detail.
Sphinx's usability, or lack thereof, may scare some off, but its configurability will make them happy. Better documentation and a less confusing interface would transform Sphinx from a good product to a great one.