Have used LH Skynet , SDT AirOps , Geneva and CTI AirPac systems. While all systems did the Ops Control job well when they failed thats when the problems began.
Out of all of them LH Skynet was the easyest to use and good support. Make sure that the company invests in a quality IT contract and decent IT people. When implementing a new system there is nothing worse than a blank screen and a goose on the end of a phone saying that "sorry but your company has stage 2 level support so call back during office hours."
Very embarising indead, by he next day a dedicated IT person appeared.