A bit late to the party, but I decided to check out beta 5 just this past week and I am absolutely blown away by this mapset. Best thing I've played in years and a really fresh experience while still staying true to the dynamics of the classic game in a sense, at least in my opinion. The new weapons and monsters combined with your mapping style (great layouts! and some of those "fast starts" are really Resurgence-esque) provide exactly the kind of fast-paced action that hits the sweet spot for me. I have to say I am especially in love with the assault rifle, my favorite go-to weapon in all even remotely dangerous-looking situations.
A package of FDAs for all available maps in beta 5 is in the attachment. Some maps have multiple demos, v1 means a failed attempt and since the maps were pretty long I usually had a small break before the next attempt v2. There are a few maps which I don't finish but instead die with one or two monsters left, at least map32 (killed by decorations...), map19 (no ammo left to kill the final boss?) and map21 (died at the exit, ammo a bit too tight for my liking). Didn't really give map25 a fair shake yet, seems like a rather demanding map and didn't really have the time to tackle such a behemoth.
tldr; I am enjoying the hell out of this and can't wait to see what's in store for the last handful of maps! Should be a slam dunk cacoward winner whenever it finishes.