Does your treatment include absorption for frequencies from 150Hz down to your lowest room mode? If not, then you want ART.have lots of treatment in the room
ART does one thing: control decay time of the reverberations of frequencies 150Hz and below. Absorption panels thick enough to control frequencies that low are not practical in many listening spaces. So, ART for below 150 and absorption panels for above 150.
An ART license is in addition to Dirac Room Correction and Bass Control, which have their own, in my most humble opinion, tremendous benefits.
I have a Tide16. Yes, being an early adopter means you will deal with some bugs, but I'm very happy with my purchase. Two channel music with four subs and Dirac RC + BC + ART... It's glorious!