In what situation would you want to use Icebreaker over your other AHD programs (Carbonite or Basilisk). It doesn't really seem to improve your odds over either of the others. I feel like I must be missing something.
Icebreaker sets BTS to zero, so against units like the Jotum, Asawira, Father Knight, etc it is quite handy. Any BTS 6 trooper behind a Firewall is slightly more vulnerable to Icebreaker too.
Icebreaker: B2, WIP + 0, (1x) Dam 12 vs (BTS=) 0 Carbonite: B2, WIP + 3, (2x) Dam 13 vs BTS Basilisk: B3, WIP + 0, (1x) Dam 13 vs BTS So against BTS-Monsters like an Interventor or Neema Saatar, you might want Icebreaker, so they save vs 12 instead of 4. (And Uhahu has "only" HD+, so no CLAW-3 programs.) Edit: Too slow....
I didn't consider the benefit of being able to more easily get through a firewall. That would come in handy. So I guess it's more to get through things with a BTS above 6.