Pros
I've been with C2 Essentials for over a decade and I can confidently say it's one of the best places I've ever worked. As an HR professional, there is a one-of-a-kind challenge working in the PEO environment addressing the HR needs for dozens of clients. Finding the best HR solution for a two person startup is vastly different that an established 300 employee firm. Each client needs a tailored approach, which will challenge you as a professional daily but you will succeed if you are adaptable and work collaboratively to parry off the strengths of you colleagues. The company culture is very inclusive. There are opportunities for advancement and the company invests in continuous learning and development. I highly recommend C2 Essentials to anyone looking for a fulfilling and rewarding career.
Cons
Being successful in your role is not always readily apparent -- oftentimes success will be defined by achieving a lot of small victories serving clients or having to learn and grow from mistakes along the way without necessarily getting constant kudos. Every job from manager to individual contributor has something he/she can contribute to applying HR best practices but be patient as process changes, undertaken to champion efficiency or to follow compliance, can take time to solidify with stakeholders.