The reason I say you need to get in and get out because the longer you are there, the messier things will get. You'll find that credit, recognition, and communication are reserved for those in the "inner circle." Secret meetings abound. Now, I completely understand the need to have closed-door or executive level meetings at times (let's face it, not all information is meant to be shared). However, this company takes that to an extreme that borders on paranoia. The problem is that with a company of young, bright, and outgoing people is that nothing stays a secret for long.
You will also find your ideas for improvements or opportunities are either squashed or stolen. If you are to succeed here, you'll have to get used to the reality that your expectations of the company and leadership (however modest they may be) will fail to be met. Promotions, raises, recognitions, and even commissions are done ad-hoc at best. The best sales leads (regardless of where they came from) will be cherry-picked by the COO (co-owner of the company), and the commissions paid to her. Take pride in your personal accomplishments, use them to build a solid resume and rapport with your client, and promptly plan an exit strategy.
Lastly, there are two examples I will provide that should raise a red flag to anyone who considers working here. Red flag #1 - When you receive your offer they will force you to accept within 24hrs. This is so that you do not have time to consider multiple jobs/offers. No reputable company does this, so let that serve as fair warning to you. Red flag #2 - During your exit interview, they will likely ask you "So, who do you feel is the next person to leave the company?". If that isn't a sure sign of executive paranoia, I'm not sure what is. So before taking a job here, you gotta ask yourself...is it really worth it? Think about it!