You may find this thread interesting.
http://www.medhelp.org/posts/Heart-Disease/lower-Ejection-Factor-after-mitral-valve-repair/show/431242
The advantages include precision, smaller incisions, reduced blood loss, decreased pain, and faster healing time. Sometimes there are memory and cognitive impairment with open heart surgery.
The disadvantages of the da Vinci robotic surgery include and relate more to the experience factor for the doctor and his or her team and lack of tactile sensation for the surgeon presents a learning curve as well.
If you go forward with the procedure, you may want to get an idea of the experience and number of successful procedures with the surgical team you have selected and any failures.
Thanks for your question.