Congrats on launching, and good luck with your startup. Personally I am much more old fashion - I stubbornly don't want a CRM to remind me of keeping in touch. I want to have my own mind to tell me...
My own mind has proven itself incompetent at this task, so I'm good with a little assistance.
I was actually planning on re-reviewing Monica soon, so I'll add this to compare against. For me my goal is just about tracking what people enjoy or don't, what we last did, important developments in their lives, whether I've updated them on my own important developments, etc...
Just offloading all the things my brain has repeatedly failed at in favor of garbage like song lyrics or API documentation.