That and they're known for closing people's accounts for very vague reasons, I guess sometimes it's for supposed illegal activities, but I've seen stories of people's accounts getting closed for things like gambling.
Can't be sure that all these stories are true, but it's something to keep in mind.

Have a look at these search results:
https://www.google.be/search?q=coinbase+closed+account&ie=utf-8&oe=utf-8&client=firefox-b&gfe_rd=cr&ei=94UUWenGCLPc8Ae3u5roDg

I also recommend Kraken!