I love this album, the best thing he's ever done by a fair margin. In fact, it has edged out Madvillainy as my favourite rap album ever. He's definitely my favourite producer, and pretty much the reason Def Jux is such a dope label.
I feel like this is a more accessible album than he's done in the past, especially lyrically. His songs are much more thematically cohesive, and coherent than before, and a storytelling ability that you didn't really see in CoFlow or Fantastic Damage. I wouldn't say he has a 'great flow', rapping is generally his weakness - sometimes he is brilliant (No Kings) but despite being my favourite off the album, the last two verses on Poisenville Kids has some pretty bad flow.
Here's a similarly glowing review I wrote a while back.
EL-P - I'll Sleep When You're Dead (2007)