User blog comment:TamerSpoon3/Assassin Champion Concept/@comment-1330314-20141209013714/@comment-24385282-20141213035021

Lee is a utility-centric assassin (when built AD he's an assassin and he has high mobility, shields, sustain, and CC, giving him good utility) who has true sight - in not one but two abilities, so if he lands his Q (which is easy as far as skillshots go) he has an almost guarenteed E for a gap-closer, slow, and up to 7 seconds of True Sight for the low, low cost of 160 Energy (130 if you don't use the slow) on a 10 second cooldown (though you can get infinite True Sight, essentially a 0 second cooldown, with perfect timing as long as you've got an enemy to hit and enough Energy. Q = 3 seconds, E = 4 seconds, Q is up at this point so Q = 3 more seconds, E is up at this point so E = 4 more seconds, then Q is up again etc.)

So why wouldn't you recommend it? This champion is less mobile without ult resets and arguably has less CC (2 slows, a stun, and a root could be said to be better than Lee's AOE knockback/-up and slow, but based on slow amounts, CC durations, effectiveness, etc, the opposite could also be said) as well as less damage by far and no defensive abilities (except situational as you could use the CC, movement speed bonus, jump, or invisibility for defense or offense), based on which I simply can't see your reasoning against the mechanic.