I haven't tried doing any transfers yet, but was planning on transferring most of my ETN to an offline paper wallet sometime soon.
Also, I know launch just happened, but is ETN being supported by any hardware wallet at the moment?
None that I know of at the moment. Currently, Only the Electroneum Mobile and web wallet are your best options right now. We should see ETN getting more support and integration for other wallets
the beauty of it is u dont need any hardware wallet and other crap
all u need to do is send coins to your wallet address and its in the blockchain forever. of course u will need the 3 keys address, view and send. u can print out the pdf you get when you create a offline wallet, or you can store it in a usb stick. that would be your hardware wallet.
you can protect your data putting your file into a password protected archive
the probably easiest and safest way to keep your coins is using the https://my.electroneum.com/ wallet manager. you need 2 email address and a phone number to create. u may even forget your password - since you can reset them using your email.
at the moment it looks like we can not see the spend and view key of the wallet the electroneum wallet manager creates. this may change in a update or not i dont know.
electroneum offers a very good way to keep your coins. much better than other coins
having centralized wallet, where you have no access to public and private keys is a bad thing (and no they will never give you the keys, because than they loose the control and they will never make sure if the reason you lost your coins is because of you or them). Blockchains are decentralized for a reason. Hardware wallets also have their reason, put your coins on a cheap usb stick and you will regret it later.
To safely store your coins you can use a hardware wallet, or use the offline wallet on a computer which was never and will never be connected to the internet, create your keys, save it on the computuer, write it down and store it in a safe or give it to your mum, so its not in the same location like the computer its stored on.