we are currently evaluating different physics engines. So far we have only looked at PhysX, which seems quite nice. We have found experiences from other people with ODE and PhysX, especially in this paper. Unfortunately, we have not found many opinions about Bullet Physics nor much documentation about possible flaws and problems.
So I am here and hoping somebody will share his experiences. And maybe somebody has a comparison with other physics engines?

Thank you very much, Enrico