I just got my I-140 approval notice. All my friends have used Chen's service and got their green cards. In fact, I first heard about Chen from my friends. Now it is my turn to recommend their service. They know exactly what they are doing and lead you through every step of the way. Sure it is a long, difficult way but having them as the leader is comforting. Always make sure to give them as much information as possible, because they can use almost any information to make your case stronger - even though you think that information is not useful. This actually happened to me. And if you ever had a problem/confusion, they will thoroughly explain it to you. I always felt welcomed by their answers. I will without a doubt recommend them