I've been using Coinbase for 1 yr now, and every purchase / transaction (buying, selling, sending) has been flawless. I think overall they're a solid exchange and have WAY better business practices than Bitfinex did. But only on a few occasions have I used my mobile Coinbase app to purchase, and only once to send. I prefer going to website via my laptop. Not recommending Coinbase. Just saying that others like me have had a great experience. I have my coins locked down in their vault for now but will take them to Trezor or Ledger soon. "Their keys, their coin. Your keys, your coin."