Project management tool is comparable to MS Project. Users that are looking for a subscription PM product rather than purchasing MS Project may benefit from this software, but I am not sure if all PM features are available out-of-the-box at cheaper subscription levels.
Although the PM tool is comparable to MS Project, it also comes with a level of complication also comparable to MS Project. Full functionality of PM (i.e. including resource management) requires buy-in by all departments/users in the company, and this is difficult to acheive in large or diverse organizations.
Our company implemeted this software with the goal of bringing project management together with time reporting, expense reporting, and invoice processing. The purpose of implementing Clarizen was to have a centralized system where we could report project status by including all relevant metrics on the project in a list or detailed view, e.g. planned time vs. actual time, planned cost vs. actual cost, and project manager comments/narrative on goal vs. result. This purpose was never realized. Clarizen underestimated the work effort to develop customizations, which resulted in the time module never being completed, the expense/invoice modules were cumbersome to use, the related approval workflows had many problems, and support from Clarizen management was almost non-existent.
We are now taking a different approach. No longer do we believe that one system can handle all our needs, and so we have adopted different systems with some integration between them to try to bring together all project-related data.