How to play with Noble Hierarch?

I've played infect for a long time now. It started as mono green in casual playgroups, and now it's U/G and sees pretty consistent success at FNM. I have recently put inkmoth nexuses into the deck, and I was wondering whether I should save my pennies to get noble hierarchs. I'd like to hear about whether or not I should, and how my playstyle should change if I do. Here's my decklist to help give you guys an idea of what I play. http://tappedout.net/mtg-decks/gu-infect-possible-turn-2-win/