I'm playing it now, not too far into it but past the big initial event.
I am really digging it. They did a fantastic job. I'm usually somewhat leery of fan-made content, but this shit is good.
I'm surprised by how many of the rooms and corridors I'm remembering from when I played it in 1998 by seeing them now.
Always did have a good memory for game maps, I can still recall most layouts of Doom 2 maps.
I guess I also did play it a second time more recently than 1998, not sure when, probably near the time HL2 came out.