You can always ask that law firm to provide you with references from former clients on whose behalf they filed NIW self petitions, and which were approved. Then call each of them, and ask detailed questions about the the lawyer, their case, etc.
If my answer is the "BEST ANSWER" and/or "HELPFUL" please mark it accordingly. Fluent in 7 languages. Certified Specialist in U.S. Immigration & Nationality Law, The State Bar of California, Board Of Legal Specialization. 22 years of successful immigration law experience. The answer above is only general in nature cannot be construed as legal advice, given that not enough facts are known. It is your responsibility to retain a lawyer to analyze the facts specific to your particular situation in order to give you specific advice. Specific answers will require cognizance of all pertinent facts about your case. Any answers offered on Avvo are of a general nature only, and are not meant to create an attorney-client relationship.
Sounds like you need to ask their former clients about their experiences. This is not the forum as you will only get attorney responses here.
Years licensed, work experience, educationLegal community recognition
Peer endorsements, associations, awardsLegal thought leadership
Publications, speaking engagementsDiscipline