We're using an even cheaper model (K2.7 right now) and our PRs cost more to review (still < $1). I imagine we have a lot more going on in terms of review, even after moving the context gathering and comment posting responsibilities to scripts that run before/after the agent. It's more of a team, so we also end up with a dozen or so sessions from the subagents used.

We currently think it worth it. The review catches things humans and two paid options miss. It's definitely a wall of text and burnout fodder, the next step is an agent/skill that will make the changes after we humans comment on the comments, because the comment wall is not sustainable.