i've actually never understood why DTF was supposed to be good. i dont like the idea of hurting ships that werent even involved in the attack. does it combo well with R2-D2?
Short answer: Yes.
DTF is cheap. You can put it on a ship the eats crits (regenerating shields or Chewbacca).
With Biggs you can willfully spread the damage you take to buffer it.
The common one is Luke with DTF and R2D2 with Biggs. Biggs takes most of the hits, but Luke can choose to eat some crits with DTF because he has regenerating shields and prevents Biggs from taking too much damage while negating a face up. Luke is still HIGHLY survivable even after Biggs dies between his ability and R2D2 regens.