Pros
Human Security (Israel, formerly PerimeterX) - was generally a nice environment to work. Good people. Good management. Tried to go out of their way to create a nice work environment.
Cons
The biggest downside to this company is their lack of willingness to create secondary market for employee stock options. This means that your "equity bonus" for working hard is never actually realized. I will never understand why companies do not do this - it is relatively simple to bring in a secondary option and allows employees who have worked hard for the company to see liquidity. There is really no downside in this. And it would be one thing if they paid high salaries (which they don't)... but if the upside is the draw and there is no way to cash out on the upside, then where's the upside?