You either fit in or you should bail.
Pros
Free tea, sometimes free booze, maybe even a taco. The office is really cool... but its an open office so get used to being up in everyone's business all day. Get noise cancelling earphones or negotiate WFH asap. But it is super cool if you have the free time to enjoy it. The parties are awesome, go to them.
Cons
I left this job, feeling like I failed. I came in and gave it all I had. I was there early, worked late, took work home, did everything I could to learn there applications, how they work, I pushed myself to my spiritual, physical, and emotional limits. And one day after months I woke up and decided I didn't want to go in anymore. I didn't make one friend. I felt like the team I was hired to be on didn't want me after week 1. I felt like a bum. I took a contract gig with another company in town after leaving. Day one I was already bringing value to my team. Week two one of my teammates shook my hand and told me she was so happy I was working there as a good fit was hard to find. By week 4 I had made two work friends that I think will be connections for life. I was a top performer again. So I figured that something was just wrong at Paradigm, a bad fit. Then Paradigm had a workplace shooting. Super horrible, but a thing that happened at a small company that broke my spirit. I no longer think I was the failure. I hope things have gotten better.