Don't use a site that doesn't give you full control of the private keys (e.g. Coinbase and any of the exchanges and ecash.io).
I saw a new one or maybe an old one, its called ecash.io. Any review/report on this?
There I fixed it.
But what are the chance of coinbase.com going haywire
Who knows?
Sure, Coinbase looks huge an seems it could be trusted now, but so was Mtgox before disclosing the hack and bitcoin loss.
Coinbase has had it's reserves audited and I believe it has been shown that they have ample reserves to cover all of their customer deposits. I think that at the time this audit was done, their security procedures were checked and it was determined that the security was appropriate for what they were doing (was very good).