We used ServiceDesk in the ISP (Internet Service Provider) that I worked for. We nearly lost hope in finding good helpdesk software with ITIL compliance. We even considered building a home-made application. For two years, BMC Remedy gave us a hard time from a usability and performance perspective, in addition to their highly priced customization bills. Until, one day, a decent consultant forwarded a link to ServiceDesk Plus.
ServiceDesk Plus breaks the myth that 'java server applications are slow' and really shows that a high quality product with good efficiency and performance can be built using Java. It's all up to the engineers (and when it's slow, its all their fault).
One thing I learned from ServiceDesk; don't blindly trust Gartner reports when searching for good software. At the time of searching, Gartner Quarterly reports listed BMC at the top with no mention whatsoever of ServiceDesk Plus. I'm not blaming Gartner for corrupt information, I'm sure they have their criteria in place, but at the end, they're humans, they have their mistakes, biases, misinformation, etc.
1. Light-weight and highly responsive. Intuitive interface.
2. Wonderful 'Solutions Knowledge Base' side feature based on articles and with an excellent search functionality. (We no longer use Media Wiki, however I'm doubtful about dropping MediaWiki).
3. The ServiceDesk API gives you unlimited abilities to automate and integrate with other applications. For example, we were able to integrate Nagios Network Monitoring tool so that a high priority alarm could automatically open a ticket on ServiceDesk Plus.
4. I admire the effort they placed on their online documention with their and searchable online you'll hardly need to contact support.
Nothing major, but would like to see improvements in the following areas:
1. Provide a visual view of all entities in the system. Virtual Machines, Routers, Physical Servers, etc. using graphing tools.
2. Provide a searchable menu. For example, if I type "LDAP Authentication" this would show me the "Domain Controllers" in the setup menu (Similar to CPanel's menu search feature).
3. More help notes & tips on 'what to do next' and on 'keyboard shortcuts'.
Value for money
Ease of use