I ended up soloing BT last night with my Lvl 12 Sith Sorcerer and companion. Just to see if I could. Was a pain in the *****, and took about an hour and a half (my first flashpoint, so I died a few times getting my bearings, haha). Got Orange chest and saber drops in that run. The first boss I was able to take fairly well. The second and third were pretty tough. Companion would consistently drop when boss was half-dead. Then I had to spam heals on myself about four times for every damaging channel I used. Not really worth it for time/reward ratio, but I thought it was a good exercise.