I played through it twice with Brutal Doom Version 22 Test 4 and I will say that it runs smoothly. I do like the added challenge these renewed yet familiar two levels present although the twin Cyberdemons (even with a BFG) might've been a bit much, even with the cover the subway provided.
Also like the fact that this map pack (at this state) doesn't play around and assumes that players are good at both regular Doom and with Brutal Doom.
I hope that future levels are just as great and challenging in future updates.
