The only issue I faced was a while ago. My card was debited, or rather it was showing as debited when in actuality, it did not debit my card. After six months, they came back with back billing. 

Somebody should have verified the billing and immediately informed us. So yeah, However, six months is too late to identify such fault sightings.

When I want to analyze the information, it would be better, since Google knows what I have used, to only show those items for analysis purposes. Especially when I look at a previous month's billing or usage across services. It's better to show the services which are used, not everything.

Google Cloud Billing should have a more user-friendly interface.

I am also using Amazon and when I compare it, it requires a bit more stability. Amazon Cloud Services are a bit more stabilizing, at least with basic computing.

Amazon by default is SSD only. When you create an instance in Google, by default it allocates to the disk and there are some performance issues. When you compare it with Amazon, the performance is a bit slow.

In the next release, I would like to see the issue with the stability resolved. I have not faced any issues with freezing or hanging when using Amazon.