Those are great, but my issue (nitpick is more accurate) with them is that they are too short. They both could have gone for extra 30 seconds or so, specially Purgatory.
Another great track from the album. The riff at 3:13 is awesome, but they only play it for like 10 seconds or so, which is shame because it's an awesome riff.
That's pretty much my only you can say issue with the album, how short a few of the songs are. Again, it's more of a nitpick though. It's still a mark of a great album when i want more of it instead of less of it.