Excellent opportunities come from MIT but they can afford to treat postdocs better - Postdoctoral Associate MIT Employee Review

Solid research and great overall experience

can't think of any cons.

High quality core facilities and well resourced labs. Countless brilliant colleagues who can serve as mentors and collaborators

Students and Postdocs are expensive due to high overhead, so unreasonably high productivity is often expected compared to other institutions. PIs are typically stretched very thin. Most departments/labs are very space limited which makes it harder to do safe and productive research.