We're a new GCP customer with a growing amount of spend as we investigate multi-cloud (coming from AWS multi-account, words can't effectively express how much of a joy GCP is to work with).
It may be because we're an attractive customer with a very large amount of AWS spend, but the folks at GCP have made our adoption pretty amazing. We've had multiple on-boarding and troubleshooting calls with the actual product managers of GCP services, in addition to onsite training/consultation with experts (all paid for by Google).
I've had to use support a couple of times and found it pretty on par with support I've gotten out of AWS.
Like any provider of services, I've found that relationships are key. Cultivating a good relationships with your reps/contacts goes a long way in their willingness to go the extra mile for you.
But, interactions with our reps have grown fewer (we're told their customer success/technical account management teams are understaffed), and it may be a sign that we're getting out of the honeymoon phase. We'll see.