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
For either DB2 or zLinux, Tivoli is hands-down the best solution. For Oracle and other operating systems, there are more advanced solutions available. Some of these features are considered "game-changing" by our Sys Admins. Of the three solutions I've dealt with, Tivoli ranks right in the middle with cost, features, and complexity. A nice solution (and the best for the options I listed above), but not cutting-edge.
Tivoli is not manageable from the GUI console and I believe it needs a dedicated resource to manage the software.
Tivoli (TSM) configuration is complex, granular, and scalable with customizable configuration features, but it requires a good administrator that has a strong knowledge of the product.
It needs additional agents or plugins for administration; for example, I have to use an MMC plug-in on the servers.
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.
Tivoli sits right in the middle of these two products, all things considered. Each has its own strengths (Cohesity has bells and whistles, CommVault works well with Microsoft). Tivoli is a nice blend and rock-solid once implemented.