Diligent, like all other companies, has its fair shares of bad apples.
If you are applying, in interviews or have recently accepted an offer then I would advise you to reach out to people who have left the company or been packaged out; they will give you an honest review of the leadership and the products.
Attrition at Diligent is fairly high, people whom have been at the stronger brands will stay until the very end but some of the more recent acquisitions have seen a significant exit rate from talented professionals.
Politics and bureaucracy - Diligent like all high-paying companies, has a fair share of politics that often take precedent over actually doing their jobs.
Culture - depending which team you are joining, interested in joining or have accepted an offer, do not be surprised if the culture is completely different when you start compared to what they had told you. Speaking candidly, I genuinely thought the company was a cult when I started since everyone was so happy but as time went on, it changed and it became borderline toxic in terms of work stress and inability to GSD.
Upper leadership is also indifferent, you are a number and your job is expendable; they may promise you the moon but do not be surprised when they give you a rock and say its from the moon. Depending on which brand you are apart of, your experiences with Sr. leadership could be positive; but I had not met a single Diligent employee that spoke favourably about anyone from the executive team past "they like to party".
If you are interviewing here, do not be surprised if they cut headcount or if your role suddenly becomes unavailable. Despite being out of the company for 3 months at this point, my former colleagues still tell me how terrible the stress has been if your brand is not doing well; from quota reductions to missing commission payments to something as simple as working with HR, certain brands are struggling.