for me it doesn't work that well... There are a lot of dead meetups, with no meetings littering the search. I also have a hard time following groups I am interested in. I think meetup sends a lot of emails at start, so meetup mails land in my spam folder now. Also if a lot of people click "Im interested" I think there should be a forum enabled, so you can find someone else to organize the meetup. Now it says "become an organiser" but it's hard to do it alone IMO.