the brilliant idea of the Monomaniac concept is that the songs must be less or around 1 minutes (in this one the longer is 1min 40sec), so the bands have to write songs that goes straight to the point, no useless intro bullshit , only stuff that grips you immediately. another element of the Monomaniac series is that it features only previously unrealeased songs so you don't know it already even if you know the band. what also makes the excellence of these comps is the quality of the bands, Panos Agoros, the man behind Blastbeat Mailmurder productions and the Monomaniac series (among other BBMM releases), clearly knows the extreme metal underground and select the finest bands from Greece and other countries, mostly Black, death, grind, and what is in between and around. the bands on the 2 & 3 Monomaniac volumes are the following :
WITCHRIST, MONOMAKH, SKULLSHITTER, NOCTURNAL VOMIT, NADIWRATH, END, HAAPOJA, DEPHOSPHORUS, OMEGA MONOLITH, BLACK HOLE OF CALCUTTA, WAKE, PROGRESS OF INHUMANITY, GODS OF CHAOS, MUTANT SUPREMACY, RAVENCULT, BURIAL HORDES, WEREGOAT, DODSFERD, NECROSADIST.
check this on its Bandcamp page.
it's on my "heavy rotation" list, as well as the releases of the bands I discovered or rediscovered thanks to it. no need to say it's highly recommended stuff.
ps : Here's the interview we did with Panos Agoros about the first Monomaniac volume, with also the link to my review of it.