you dont want hard plumbing all the way to the filter, just out of the tank then to a small hose to the filter so you can take the lid off
Makes water flow ALOT better and its much more hardy... avoid the fear of pipes slippin out of tank etc, its also great of you have an overflow
Deffo Recomended if you're planning on keeping the tank in situ with everything the same
not so good if you're going to upgrade filter in near future (may need dif size piping)