Is Trezor compatible with IMac?
Sounds like Breadwallet but in an iPhone, in concept. Better or worse?
in theory, trezor is not like a breadwallet but it is a type of hardware wallet . you have to buy it from an online shop but it is not so cheap. but the best thing is trezor wallet stores your coins in an offline environment so that no hacker can take control over your wallet. @op, you have taken a very good step.
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Are they any reports where Bitcoins where stolen/hacked from a Trezor or KeepKey?
no and believe me, you will never read any such reports. because hardware wallets are the most secured wallets unlike others.
Can i store more than just Bitcoin on them? I mean altcoins like ETH for example.
trezor can be used to store litecoins and dash. it is compatible with altcoins but the coin developers should integrate the support.
Can i have more than i wallet stored on them, i a way that they operate totally independent with no traceable links between them? Or would i need 2 devices for that?
you can store more than one address in your trezor wallet.