No doubt Chen's NAILG is leader in immigration petition for alien worker. Chen helped filing my I-140 in EB2-NIW category and experiences from start till approval is "outstanding". The way they prepares sample letters, guides for drafting email to contacts and assemble the packages is excellent. Chen had to do some more works due to my RFE from USCIS. Nevertheless, Chen's responses to preparing RFE documents was also remarkable. We could only argue to USCIS with proper documentation and getting those ready is always challenging. Chen's RFE response methodology to me seemed very technical and rigorous. My experience with Chen thus met my expectations and would definitely encourage many other to get on board. Thanks Chen for helping with relentless support till approval, this has been a great relief now.