It is hard to speak as a whole about the Corcoran Group since it is basically independent contractors who fall under the name. I can speak about the broker that my friends and I used when looking for a place, Samara Heafitz.
Samara was a great broker. First and foremost, she was honest and trustworthy. I looked at apartments with several brokers beforehand and they all tried to rush me a long and make a decision that I wasn't ready for yet. Samara didn't push my friends and I into rushing through the process.
Moreover, she quickly got a sense of what we were looking for and did a great job of screening apartments so as not to waste our time. She didn't try to get us to look at apartments outside of our price range to increase her commission check.
Samara did a great job of showing us apartments. She is friendly and easy to work with and works assiduously for her clients. Highly recommended!