Its hard to find alot of information on most of the MAT's available other then methadone thats been around for a long time.
Naltrexone ( Vivitrol) I believe is mostly prescribed to minimize/eliminate cravings for alcohol. It seems to be having mixed reviews from users. I believe it will be quite a while before we will see clinical research and studies that either promote or negate the effectiveness of it since its relatively new ya know.