Pros
The only thing Vertex has going for it is its science. The company is successful despite itself. Unfortunately the EC can't get out of its own way, nor can the countless senior leaders who all waste time, resources and employees' sanity pandering to them. Longstanding Vertexians, and those who do well managing up to longstanding Vertexians, will do well. It's hands down survival of the fakest.
Cons
The performance review cycle is an absolute joke. Stakeholder feedback is completely anonymous, which is fantastic for a company that operates on talking secrets about its employees behind their backs, and then lets them go for "underperforming" when there was never a word uttered to that employee nor an opportunity to improve ever truly given. Like that? You'll also love that in cases of a 'Building' rating, one where improvement is needed, you are also not guaranteed an actual written performance review that articulates the ways in which you didn't meet your primary work objectives. Even better when the company's own analytic tools provided demonstrate that you met and/or exceeded all but one. From what I have seen and experienced, HR can't even treat their own employees with respect or integrity through this process.