The Pro addon is basically a legacy product for legacy mainstream packages that were (sometimes severely) rate-limited at various times of day. It is not supposed to be necessary with the latest packages.
It can be turned on and off at monthly intervals, so if you wish you can give it a try after the connection has been live for a while, and see if it makes any difference.
Oops! I see it does now say it can help VPNs a little. It seems there has been a policy change since the current products were introduced, as it was definitely publicised as being unnecessary on them.