Sam,
After I posted this and didn't receive a response, I went to our ESRI account manager. He was extremely helpful and sourced a Galaxy Note 3 and tested it with the Collector app.
They tested it on point and polygon files (with subtypes and domains) and found that the stylus made using the app more accurate and there wasn't anything they couldn't do with the stylus.
I hope this helps you as much as it helped me.