The Ledger Nano S integration will be a great thing for a lot of people, you don't need more secure wallet if you have a hardware wallet. The best thing is that if you use android and have a Nano S, if you connect it first time (Micro USB - Micro USB OTG cable for android) successfully, and e.g. you use Mycelium, you will be able to check your balance in the app even if you don't have the hardware wallet connected. You only need to have the Nano S connected if you want to send coins or sing a message... This would be nice for the iphone as well I don't know when it will be available...