wallet can be hacked but it is depend on your security so try to download offline one and save your private key
I think it's good wallet and it's not to possible to hack this wallet key is security.
Bit coin is digital gold and the biggest war in information technology is the making and breaking of it security. Till now there is no such security available in information technology which cannot be broke. The world is full of professional hackers who can any time break the better and best available security, so in case of bit coin it is also possible. The major question arises on internet is security problem. So be careful by using your wallet.