Question about Scrivener iOS

As a user (and fan) of scrivener for windows, I was wondering if I should take the plunge and get the Scrivener app for my iPad.

My current go to when I’m mobile is IAwriter on my tablet synced with dropbox. Most days this gets me through till I get home to add it to Scrivener (if I’m not too lazy). I also have a 17" Laptop which really weighs down the laptop bag but for the coming NaNoWriMo was going to be my default so I could work in Scrivener when I was out.

So Scrivener for Windows/Mac and iOS users do you feel the $20 is a worthwhile investment?