Sound quality is very good and clear. Running time is about 45 minutes each side. Some songs are blended together so it can be a bit hard to determine where one track ends and another begins, but it's mixed really well if you're not bothered by that. I really like the songs on this compilation of demos. All are very interesting and very much like their other works. It's a very heavy sound, almost droning, with lots of complexity and moments of intensity. The demos for Black Mantra and Oxygen Mask (demos from Pressurehed's Explaining The Unexplained) have a unique twist but still recognizable. This tape by far exceeded my expectations and comes highly recommended.