Pros
They certainly have every specialty under the sun. Pretty wild to review the new client lists and see the things they're working on. Cult-like loyalties exist in some parts of the firm. They have some excellent lawyers there and some pretty well-known ones.
Cons
I was a shareholder at GT for a year a couple years ago. I made a big mistake, leaving a nice regional firm that was near the bottom of the AmLaw 200 for Greenberg. I ran into a culture that just didn't suit me in any way. The office I was in was highly, highly Jewish and I felt like an outlier from the word go. I didn't find that their platform was any better in terms of getting business than my old one. There are three levels of shareholder, and the lowest level (which I was) is a far cry from the highest. Unlike the behavior in a true partnership, everyone absolutely kissed up to our office leader and to the firm's new CEO (whose lawyerly bona fides wouldn't, in my opinion, be good enough to get him a job as a lawyer at the firm). The firm is absolutely ravenous about billing and collections, and that just rubbed several of my clients the wrong way. I don't know -- interesting place but just felt like a complete outsider from the word go. Fortunately, I was offered a in-house job and quit before I was let go (which was a near certainty -- I could literally feel the ostracism). I guess I should write it off to just getting a bad start -- never seemed to get my stride.