Pros
Due to vague and disregarded job descriptions, ghost management and barely any performance reviews or objectives, you can pretty much keep a job here indefinitely, barely do your job and get away with almost anything as long as you're halfway good at BS'ing. Sometimes it can even get you a promotion or raise. If you're into company politics and mind games, this will be a great challenge for you. This is probably the best off-menu development opportunity. You can build your professional network via clients. Your tolerance for stress and futility will increase. You don't have to worry about being politically correct. You will work with some incredible and dedicated people, and be able to often commiserate about how things are in this company, how you'd fix things if you could, wondering if management is truly listening or doing anything. Clients seem to know you have hardly any backup and they usually go easy on you. They're the ones who come and go.
Cons
There are little or no professional development opportunities. You're on your own here. There won't be much training for the job you'll get hired for either. It's not truly a cybersecurity company, it's more like a networking MSP with a few overworked people on staff to cover miscellaneous cyber services. Very little opportunity for advancement, especially to management. Management positions are reserved for the Old Boys Club--buddies, relatives, and the occasional political mind games champion. Each location/office plays by different rules. Such as with PTO, benefits, stock allocation, office policies, etc. The culture and politics are hard to navigate at best. Unless you're an extremely high performer and it's obvious, you will get a pay increase when it's "your turn" and not when you accomplish your performance/development goals. The clients who know they are big fish will constantly make you bend over backwards just to make sure they still can. They're the ones who renew their contracts.