windmill is negative on hit (-2), but its still safe from most stuff. you definitely don't want to be jabbing after a windmill. block, backdash, teleport, even jump; those would be your options if you don't have meter. if you have meter, switch cancelling is definitely what you want to do. 400+ for 1 bar is worth it off a windmill.
random yoshi windmill easy hitconfirm switch cancel into meterless hugo bnb is a scary thought.
seem to work about as much as yoshi and heihachi i would imagine
i am curious on something however, i saw a law and yoshi vid posted on srk, and basically it ended with knuckle dash juggle into pandora into yoshi super. i wonder if he would be able to do that with heihachi due to juggle state?
also, my mind is turned. yoshi is a great fucking character who got reamed hardcore by capcom too scared of his swag. curious how hugo, rolento, ryu, rufus, juri, kazuya, and raven got away with it tho
edit: this random fucking keyboard copypaste is fucking up my posts hardcore