160m - 170m per phase on t6 vs 40 - 50m per phase in t7
Loot crap vs cool and four times more time required. No one can ever explain me this logic.
Back to the topic:
Visas Marr is only useable in p1 and p3 (but there you want to have attackers only)
P1 as best used with a gmy/hyoda/ezra+x team
If you got that team use your jtr in p3
Kindly note that Visas Marr heal is completely bugged (her release was in February). It will heal the one with the lowest combined health and protection. As Nihilus will attack directly the health the protection stays and so it will heal to 75% no one. People at full health and with less protection (combined less than the attacked character) will receive a buff and so you can see how broken this character is. She is as good programmed as the HSR.
However in that team mentioned above she will do real great damage. She is more a dd with a group heal once in a while than a healer. She got no cc and she is terrible at fighting Sith (starting with Sion in sith raid and ending with all Sith you can imagine in arena unless she is hidden from r2d2 or got tenacity up).