@Rafal K. I am a member. I was unsure as well about paying for membership. You can attend your first General Meeting for free to see if it's for you. Arrive at 6PM to spend time at the New Member breakout to learn more about the benefits. There are other smaller breakouts before the General Meeting too.
I'll be honest and say sometimes the meeting speaker is hit or miss as far as educational content. DIG has to pay their bills too and sometimes a National RE speaker is brought in that is more sales-ey than I would prefer. Pushing for you to pay for his classes, books, etc. Other times the speaker is more about educating than selling. Although many of the people that speak sell books but aren't sales heavy about.
Once you are a paying member you can attend the DIG subgroups that are held various times of the month and are more focused on specific topics. e.g. Investing in vacation rentals or specific geographical areas, etc.