Ivey ad my plus for about a week. It's definitely big but so nice to see things on a bigger screen and apps/Siri seem to work better. There are apps out there for 1 handed keyboards if that's an issue. It has numbers, keynote ect. and that makes the integration with my ipad really nice for business.
I almost switched to the note 4 but stayed Apple because of that integration. Also, I've heard friends having huge issues switching and text messaging being messed up. If integration isn't a huge thing, I'd recommend going to the note 4 and buying an iPod for iTunes music for the car.