The best case scenario for Andover traders is if Sunguard retains them. Then they won't face any type of problems. But since the rumor has Sungaurd wanting to discard the traders, here's what they may face:
1. The swith over to another firm could possibly create problems, since all the lines would need to be re-routed, which could take some time, and software would need to be changed. There could be some time off from trading.
2. Since Hammer would now be owned by Sunguard, the traders would have to learn a new package. For example if the prop area was sold to Worldco, then the traders would have to learn Belzberg, Generic uses REDI +. This would pose a problem, since none of those are hot key based, except for REDI, but mainly for nasdaq.
My suggestion, look for another firm, from what I understand, these types of changeovers don't go over well.