I dunno about the Official Efficiency of it all, but its just hilarious to fly. Bunch them up with the Gravity Well, sensor scan to lot, then hit them with the Spread 3 followed by the Destabilized Plasma Torp, makes such a wonderful mess. My current record is a 244k hit, but that was with 5 people super-stacking debuffs on a tac cube, so obviously not an average hit, but it was awesome.
The other wonderful thing about it is that the T'varo can use science powers without dropping the enhanced battle cloak, (although it does the 3-second flicker for everything but mines).
It's also pretty cheap to gear, if you go with a transphasic torpedo build - I was (carefully) soloing Borg cubes in eSTFs after one evening of episode replay, before picking up any rep passives or anything.