Pros
You learn about exciting companies, your colleagues are also cool. You can built relationships with the founders and build your network in the startup ecosystem.
Cons
Overall very toxic culture. Avoid if you can. CDL is a club for mentors and you will not be a member of this club. They will not let you talk to mentors, they will not you even allow you to switch your camera on if you are at the online CDL sessions, because it "distracts mentors". You will never be seen or heard and will be shut down if you want to speak-up. The management is self-absorb with the greatness of CDL and their own greatness and refuse to think critically or listen to anyone. It's a bit like a religious cult: those who follow the religious dogmas get promoted, others leave.