On balance I would say do it. The info is quite useful but it was mainly the friendships that were by far the most valuable.
Our DCs are now 18. 2 moved overseas, 2 elsewhere in the UK and 2 of us still live nearby and are close friends. The rest of us are still in touch on whatapp and had a reunion with all the DCs at Christmas.
Particularly valuable were those early days. 4 of us lived within walking distance (part of the reason we became so close - brilliant if that happens) . No one who doesn’t have a new born will want to discuss the things you need to endlessly discuss. It was a life line.
I didn’t feel close to anyone on the course. We had nothing in common really apart from living close by so don’t expect instant friendships. It was only once we met up after having the babies on a regular basis that the friendships happened. I’ll be forever grateful to my NCT friends.
That said I have friends who didn’t keep in touch at all once the course was over. It really does seem to be pot luck.
I do think living close by to each other really helps even if you aren’t the kind of people who you would naturally be friends with . We saw each other practically every day in that first year.