Anyone running InsightCloudSec on a 50-node GCP project?

Considering moving from a pure GKE monitoring stack to InsightCloudSec for broader GCP coverage. Need real-world feedback at our scale.

We have:
* ~50 GCE instances + GKE clusters (mix)
* Multi-region setup (us-central1, europe-west1)
* Heavy use of managed services (Cloud SQL, Pub/Sub, Memorystore)

Questions:
* How's the agent overhead on VMs? Docs are vague.
* Any major gaps in GCP service coverage compared to Azure/AWS?
* Rule tuning a pain? We need to suppress certain expected "findings" in dev.
* Ballpark cost for ~50 nodes? Their pricing model is opaque.

Looking for gotchas before we commit. Tried their trial but it's limited to a single project.