I seem to be struggling with finding out what the disadvantages of using the On Demand CA PPM service is. I understand the Pros for moving towards an On Demand service, as outlined in the documentation, but the Cons (assuming there are some) cannot be found so easily.
What are other peoples experience with this Service?
Is the migration from On Premise to On Demand straight forward?
Can custom functionality, which may not necessarily be supported by CA, be introduced and can your instance be fully customised as it can with the On Premise version?