Multiple users can execute tests independently on their own computer because the QTP scripts are stored in Quality Center which is web based. All test cases are stored in one location (Quality Center) which makes it easier for users to access and maintain.
Cons
Con
When a particular version of Quality Center has reached end of life, the customer is forced to upgrade to the newer version to be eligible to get technical support. The upgrade process can be time intensive and requires a lot of planning.