As I said before, not only for Spectrum, but for any monitoring tool, you need to know what is critical in your environment and think about how exactly you should monitor and treat it. If you have done that, everything will work just fine.
Well Suited - Networking Monitoring
Less Appropriate - When you need to customize some monitoring and to update the version
If you are looking for a software that looks decent but is not something you truly rely on, this is it. I have had bad experiences with IBM Tivoli Monitoring reporting on system errors that were not evident on the systems themselves at all. There is a lot of specific alerting you can set up which is nice.
Other tools I have used are more server/application-centric. CA Spectrum seems to work effectively and efficiently for network devices. Notification delays can be set to grant grace periods in case of network blips or false positives, which occur ALL the time. Other monitoring tools send event notifications immediately and would clear instantly, which while on-call can wake a technician for no reason.
We selected IBM Tivoli Monitoring as a bundle deal, other than that I would have probably gone with another vendor. We use Brocade Network Advisor for our SAN also which I would suggest to anyone over this software. The software has not been that reliable for me since we started using it.