GCP gold support is great as you actually get through to an SRE, silver (what I use)... Not so great, often you'll submit a ticket with a ton of technical detail only to have them come back with something asinine rather than escalating it if it's past their understanding. The difference in price is pretty striking though, so it's no surprise the different in quality of service is different.

Honestly though I can't say I've ever really needed support on GCP, most of the times I've raised tickets its been due to funny behaviour (slow spinning disks in us-central1 was the last one).