Fuze is the most complete and easy to manage UC platform I've ever seen, plus, since it it cloud based, there is no need to manage server hardware!
Since it is cloud based, you don't have access to everything you would like, for example, adding a new phone to your environment requires that you register the mac address with Fuze, then you have a limited amount of time to plug the phone in, in order for it to get its config.
There really isn't much you need to know, get a demo, do a trial, kick yourself for not finding out about Fuze earlier.
with their highest tier it includes global long distance, our company will be saving over 1 million dollars A MONTH in LD charges ALONE!! This is incredible!