We use c.support at work as well. It works very well for our needs, but isn't too too customizable (yes, you can add custom fields, but our company is used to all of our in house apps being custom built, so if the system can't do something, they expect that it can be easily implemented/customized).
The reporting is also somewhat basic, but if you have inhouse SQL knowledge, you can use the back-end tables to create your own reports. If you plan on isntalling it on the full blown version of SQL Server, you can also use report builder to create ad-hoc queries.