Never joined myself but know people who have. I've always been put off by the rules and regulations that go along with it. May have changed since I last looked at it as this was a good few years back but the major issues I had were:
- You had to introduce a certain amount of people (which may be why you're always getting invited)
- You had to attend or send a substitute, you are allowed 3 absences in 6 months, after that they prob put you on detention or ring your mom
- No leeway in the one person per group per profession, design and marketing covers very broad area
- I don't want to talk to anyone at 6:30am let alone a bunch of people trying to sell me their services
I did join 4Networking for a six month trial which was a lot more relaxed and has a good online forum too. Personally though I find the whole thing a bit cringy and like speed dating, but more to the point I couldn't find the time to go often enough to warrant the cost.