Well when I first tried this build I was pessimistic, my friend (ninjaboy) was very slow with this jungling build. I decided to try it for myself, I did very well with it. I went 10-10-11 in the game and it was my first time with Jungle Irelia and we only had 4 players. In order to be good with this guide though you have to gank hard and get those assists and kills early, in the first 10 minutes I was 3-0-1. I pretty much bought 3 of the 6 things already so I was pretty much set this entire game. If you do not get good ganks in at the beginning then you're going to have a bad game although you could recover mid game. Overall good build, just needs more guidelines on why he picked the items and such.

Edit. Second time playing Irelia with this guide, got a pentakill.