I have just tried Phinn recently as I have a hubch that he will be the next op within the few patches. You build is greate, but I would like to make a suggestion that if your enemy team consist of fragile laner and jungler, shatter glass is a better first item to rush as I found the A damage is enough to one-shot any squishy heroes when their hp is something below 70%. In addition, I would also recommend clock work as a fourth or third item because the hook can be used more often which...

Solid guild, however, I would like to make a suggestion that an early light armor should be bought before finishing fountain because I tend to die easily despite double oak hearth when enemy is heavy WP.