Here's Go's Gerrit instance and an arbitrary change request: https://go-review.googlesource.com/c/tools/+/313749

Prepare to be disappointed and confused. It really doesn't click until you use it, and you discover features like: attention sets, a working dashboard, commit==CR==multiple patchets, stacked changes, push-to-update/rebase/stack, zero friction comments, comment porting, customizable checks and labels, lightning fast keyboard shortcuts, ...

Used (an older version) of it in Amazon in 2016 - it was pain in the ass I've not seen in dev tools before.

GitHub's PRs and even Microsoft's internal tool for reviews (in 2012 only working with Source Depot) are about 5x more pleasant to use subjectively.