Gublade underrated?

In some games, i buy this item and it always feels really good, especially vs ranged champs. We all know omnivamp is a really really good thing for voli, and also both ad and ap on the item gives you really high damage, as your q and w have pretty good ad ratios. The slow guarantees a q e combo no matter what. Of course its not optimal for every game but there are scenarios where it really fits. I want to hear some opinions as i have never seen someone else buy it.