Forum:Wit's End

Hello everyone, I am a LoL player from a couple of months already and I like to watch professional players' streams and I noticed one particular thing... A lot of them take Wit's End on tanky dps champions like Shen, Dr.Mundo etc. I know its giving you really good stats of MR and some bonus attack speed which is always good, but, they take it before anything else, I mean, for example The Oddone- He is buying right after HoG, which is ok at some point of the game,but he ending up too squishy that cant even tank the enemy team for more then 5-10 sec. I dont say they are wrong, they know much much better then me ofcourse, but I personally think will be much more better to take this item in mid-late game. I watch The Oddbro alot and I can say that he is really squishy when ganking and most of the times ending up blaming the laner when they fail to kill the enemy laner. Anyway, what are your thoughts of that item and do you think is viable on tanky dps in early game?