I would do some investigating before I would join such an organization.
Who are the instructors and what are their credentials?
How do they keep records and what information is kept?
Is there any live training or is it all online video training?
What kind of insurance do they carry?
And do they have professional and private references that I can talk to?
I don't want my private information stored where it could be used by ABC agency to track my habits or be hacked to be made public.
I had it a while back. IMO it's not worth it. I took a Carbine class from the main instructor and came away VERY unimpressed vs other training I have taken.
Opinions will vary and I have nothing against him, but I don't think PDN membership offers anything you can't get off the Tube for free.