It is packed with tons of high quality sounds. Most are very inspirational to create something with. I find myself using it for pads/strings/plucks/leads/bass - Very easy to dial in a sound that works with the song you're creating. To me, it's easy to find bread and butter sounds that just work well in a mix. But there are definitively specialty "signature" sounds as well. Such as tiesto, etc.
I've listened to some of my older tracks wondering - "damn, that pluck/lead sound is amazing, what did I use?" - It turns out it was Nexus. Been very happy since using Nexus.