I am not a fan of the pre-destination dispatchers because they really only work better in certain types of buildings. If you have for example a government building or higher security type of building, they could work well. The idea being that people arrive and go to a certain floor on a consistent basis. On the other hand if you have an office building with a pretty random type of traffic it doesn't work well. It's not that the system doesn't work but rather that people don't generally pay attention to what elevator they get on much less even the direction they want to go. In low rise applications the typical ETS based dispatcher works good enough. You can only get so fancy when it comes down to dispatching four elevators over the range of 10-16 floors.