As a Coinbase user, I'd love to get away from Coinbase but I can't get them to even acknowledge the $5,000 I wired them 15 days ago. Two emails into CS and still no response from them other than an automated email stating they are really behind. If I can ever get my money back, I'll never use them again.
Gemini seems to work well and be much more reliable, albeit much smaller and not as functional as GDAX.
UPDATE: Coinbase email about my missing wire, the first response in the 15 days since my wire:
"This is an automated email. As we experience rapid growth, we are also experiencing a high volume of support requests and we regret not being able to answer your inquiry in a reasonable amount of time."