No one's mentioned this yet, but if you do exercise it may cost you more than $20 a share. In the US at least you need to pay taxes on the difference between th

No one's mentioned this yet, but if you do exercise it may cost you more than $20 a share. In the US at least you need to pay taxes on the difference between the exercise price and the fair market value of each share. If FMV > $20, the difference is counted as income by the IRS.