Just a fun anecdote to throw in:

I never bought through Coinbase, but I did sell some coins there recently for like $7k. They deposited the $7k in my bank account twice, and then a few days later took the extra $7k back.

So although ultimately it all worked out fine, they do seem to be ridiculously reckless in their dealings with thousands of dollars. I can't imagine my bank doing something like that. Made me very wary of dealing with Coinbase in the future.