Anybody else having any issues?
I've had some miscellaneous issues before with transactions left in pending status after they were, in my mind, complete (money withdrawn from bank account and bitcoins credited) but eventually the transactions did get resolved.
As of today a more serious issue emerged. I had sold a small amount of bitcoins and saw that they credited my bank account TWICE for that amount. Now I'm sure at some point they will probably notice and reverse the 2nd transaction, but still - consider if the reverse had occurred and they had, for example, debited my account twice for a given bitcoin purchase.
In short, I would be VERY CAUTIOUS about making any large purchases through coinbase, especially if you are linking in a checking account where mismanagement on their part could result in overdrawn fees or checks bouncing for you. They appear to have some serious stability issues on the back end, though not too surprising keeping in mind that they are still in BETA.