I retained Chen immigration law firm for my NIW case. My case was approved with no RFE. I am very happy with their service and would recommend them to my friends. They are very knowledgable and professional. Because of the number of cases they deal with, they also know about recent trends about what factors affect adjudicating the cases. This was particularly reassuring in my case. They are also very patient. I had difficulty getting a fourth person to write a recommendation letter for me and I had to constantly update my list of potential recommenders. They were always patient and very helpful during this process. Eventually, we were able to find someone!