It's a headache
OK now seriously, it's actually a feature which encrypts ALL of the data on the device. A few issues are experienced while using CP such as not having tasks sorted by category, not being able to change the password of a device remotely and having activations last a lot longer (and risk failure)
CP is a good idea in theory, but as John said, if you have it enabled and wipe the device, you will be out of commission for an hour and a half at least.
Another tip is to remember that you can enable CP from the IT Policy, however, if you change your IT Policy to not force CP, and the device already had the original policy enabling CP, CP will not switch off without manual intervention.