To counter anecdote with anecdote, I've had no issues with coinbase and have found them pleasant to use. That includes transferring to gdax/selling/withdrawing, etc.
Example:
Ann Rule was on a first name basis with Ted Bundy before he was caught. He didn’t murder her or any of her friends once. Its probably fine to take a car ride from him.
My USD withdrawals always show up in my bank account 2 days later.
If you're not buying with the intent to hold, I recommend depositing USD to their exchange GDAX. Fees are lower and you can sell/withdraw immediately.
Recently logged in to find that previously verified ID documents were somehow wiped out and my account became restricted. Reverified ID without issue, but account still restricted. Been 13 days and nada from their support save for an automated response.
That said, it seems closer to the truth to say that they're simply under load. But it's hard not to wonder. There's no way to know there's a problem until it's too late.
It's a good reminder to keep your coins off Coinbase.
I'm finding that keeping coins off of Coinbase is easier to do than keeping cash off of Coinbase. It's fast and cheap to transfer cryptocoins to Coinbase, but takes me days to add cash.
And then Bitfinex is not processing BTC > USD transactions for ">250BTC"...
A VC-funded SV company should do better.