I do not own any Trezor hardware wallet but as i have seen many review here in forum,
It seems that this hardware wallet is one of the most trusted and secured wallet.
It's much more safe than using online wallets, and trezor can be integrated in Electrum AFAIK.
I just checked on their website.. it's more secured than online wallet yet easy to use and supports not only bitcoin but doge,Litecoin, Namecoin, Dogecoin, Dash and Testnet. I might get one when i have the money.
Not everyone has the opportunity to buy a trezor,
Because it cost a lot for new bitcoin people.
But i think that if you hold more than >10BTC a trezor is needed.
Right mate.. at $99 plus shipping fee it's still pricey.