Bill of Rights – How Startup Employees Often Get Screwed
equityzen.com
equityzen.com
The problem with statements like this is that "unreasonable" is different for everyone. For me, it's anything under 10%, for the VC, 1% might be perfectly "reasonable".
Instead, get a lawyer to read over any contract you might sign. Chances are, your equity will be worth $0 when the company folds in 2 years..and it's better to get your full market value in the form of a paycheck.