Because of my bad bad bad breakfall capability, getting thrown koshinage scares the %&^$#& out of me. Although when Gleason Sensei or Ikeda Sensei have thrown me, they seem better able to control my flight!! I know it is my job to control myself and work on it a lot. But....I have yet to learn the fine art of flying sans wings!!
I like to use tenshin nage. Gleason Sensei talks a lot about taking control at first contact. I find that tenshin nage is is excellent training for taking control at first contact. It teaches me to feel Uke's mood and movement, rather than try to just muscle her/him down.