But still it is a web wallet and you should be aware that web wallets are still vulnerable with anything that can put them in trouble.
If you want to store big amount of bitcoin then you have to purchase your own hardware wallet. And regarding with the confirmation time, just pay higher fees if you want your transaction to get confirmation quickly.
I am also the user for the blockchain wallet for the long time but I really feel inconvenient due to their high transaction fees consumption from the past two months. If the block size has been increased we will find the transaction fees decreased and transaction speed also will increase in future.
Except transaction fees, I think that blockchain wallet is one of the best wallet for the web wallet users.
For security concerns, you do not go to any online wallet. You should prefer the paper or hardware wallets.
There's nothing to feel inconvenience because of the high fees, it's normal since the miners are asking for that and not blockchain.info.
They are just implementing what's the suggested miners fee and as for their statement they are not putting an additional fee for that when it comes to security I still trust blockchain.info wallet.