Pros
Research work can be good based on which lab you join. Only if your PI understands the importance and relevance of breakthrough research, which should be applicable to human diseases to great extent. If you really get a good PI and really good salary then join otherwise find some other.
Cons
Open violation of NIH policy and rules regarding the stipend levels. Even if you perform much better than any other post docs, you will not get any promotion neither you will get the stipend as per the rules of NIH for the stipend levels based on years of experience, even if your track record of awards publications and conference presentations is good and above the other post docs who do not perform and do not have worked out studies. Clear discrimination between Americans and third world country post docs. Shame. NIH should take serious actions against such institutes and principal investigators who are biased and violate the NIH rules.