I have actually heard of a large number of people that have had a fair amount of issues with Coinbase, the overall sentiment seems to be negative towards Coinbase due to a severe case of mucking about with customer accounts and not leaving the wallet owners alone all the time, many stories of frozen accounts and the like. I would likely prefer to keep my wealth out of Coinbase, in fact I do as I have transferred away from their platform and onto blockchain for my online wallets. I don't like their business practices and I will remain outside of their influence for as long as I can, personally.