True, although if I were coming on-board as a cofounder, I'd expect to be there for the long haul, so they don't affect me all that much. I'd prefer to see both partners have pretty standard vesting, probably 4-year.

I do take vesting into account if I'm joining as an early employee and I expect the company to be bought out soon. I believe that acquirers can do whatever they want with an employee's unvested options, and this is a pretty easy way to get screwed.