The best feature is that it saves you time by creating your presentations in one place instead of having to create them individually, which would be very tedious otherwise! I dislike how difficult this software can sometimes get for no reason at all - so frustrating when trying to do something simple like move slides around or edit text boxes etc..
It's great if everything works as intended though- just make sure everyone involved with using Deck has basic computer knowledge (ie not too technical). We've been able to save hours of work from each meeting going forward because every presenter now creates their own deck together rather than making separate copies themselves after they have finished writing content down.