I currently hold most of my bicoins on blockchain.info, however my trezor should arrive in a couple of days, so I'll be using their wallet after that. I use mycelium on my phone as well.
I also use blockchain.info because when I forgot my coinbase wallet password, my friend told me to use blockchain. and it is good enough during this time. there are many features of it and the performance is good because it has blue colour. actually I forget how coinbase looks like and I have never used the other wallets so I cannot compare it with others well.
Ya no doubt blockchain has already steady.I also using block chain for saving my bitcoin.But not all bitcoin i store at block chain because like we already know,the chance blockchain for getting exploit is still have even the chance is low.