It's got that nice 'type-form' kind of interface thats lovely to use..
Seems to do more logical stuff than confluence.
You can't colour a bit of text, it has to be a whole block.
No gliffy diagram stuff.
I actually was just so sick of confluence and was asking someone at #Productboard about what they use and they told me about this. It's just pretty fun to use. Also the free trial is helpful if you're a small startup.