till today, i am still using coinbase.. have more than 2years.
I use more wallet, coinbase, blockctrail, block.io, blockchain, mycellium, also xapo
but my main address at blockchain and mycellium
Having multiple BTC address's a decent defense to make sure not all you BTC disappears if hacked. This way you only loose one wallet which is good.
If you have all your eggs in one basket. It's kinda a single point of failure and you are done.