The main advantage for me is reduced runway occupancy time. Normal auto brake requires either an exit that matches the deceleration profile, or an acceptance of the occasional missed exit (or coming up dramatically short). BTV is weird to experience because you can go rocketing down the runway with no braking, and then the equivalent of about medium autobrake (probably equivalent to 4 on a Boeing) cutting in pretty late.
I like it, but I like the use of the instinctive disconnect on the thrust levers to knock our the auto brake even more.