In transition you will likely have the opportunity to join, or come across networking groups. The decision you have to make is whether you want to join one?
The first benefit is discipline, attending (normally) weekly meetings and being held accountable for your productivity in networking by your peers. The second benefit is advice, on a range of search related topics from application to negotiation of offer. The third benefit is networking/connecting with executives in companies and around opportunities that you are targeting, working with the group's networks.
PEN is unrivalled in the sense that it can re-frame your search; in terms of being held accountable to be productive in networking, providing depth of experience through peer advice/coaching and being explosive in creating new networking opportunities.
PEN is about landing in a great role, not about meeting weekly to discuss search and transition. If you want results, PEN can help speed you on your way.