If you take this build, you'r be probably dominating in the early game BUT, in the late game, you'll need to relay more on kill-steal skill, since you'r attack won't be that strong. But if you pick you'r timing and you'r targets, you'll have one Lee Sin to be feared!

EARLY GAME
In the early game, you need to bully enemies with you'r 'q' BUT ONLY if you have you'r 'e' on standby, that way you can attack enemies, and then slow them down if you misscalculated their AD. So once you have you'r third lvl, you can turret dive and then safely dash back to you'r allie/minion, you'r armor seals will take the most damage in. If you go back to the shop and you have some extra cash ( 75+ gold ) buy wards, and place them in brushes, not only are they gonna reveale that area, they can proove worthy when it oomes to safeguard dash.
LATE GAME
In the late game, you'r attack damage will be medium sized so you cannot go hand-to-hand combat with anyone. Pick you'r targets and tend to kill-steal ( NOT ALOT ). You'r armom will make hard for the enemy team to kill you, therefore they will attack you less, and you'll have greater chances to kill them.
The most best tactis will be to pick you'r target in the enemy team, and wait until he is in close range with you'r teamates, then throw Sonic Wave/ Resonanting Strike and then Dragon kick him in you'r team, and then just safeguard to you'r allies, and if you can pick up the kill.