Version 2 of the original dm_vertico from 2008.
The primary reason for updating this map was that the original map had major cubemap errors. I have gone back and fixed the cubemap issues, but modified quite a few things as well.
This map redefines vertical combat. Instead of just having bullets flying up and down a map (the typical definition of vertical combat), this map emphasizes the player's vertical movement. In less than a second, the player is able to move to three different levels of the map. Instead of having various sections of the map connected horizontally, this map connects different areas vertically. This makes the player location unpredictable and gameplay more strategic.
http://www.snarkpit.net/index.php?s=maps&map=3337
My only complaint would be the tight confines of some places, but otherwise it's pretty good.
My only complaint was that while we only had 5 or so people playing some of the areas could potentially get too cramped up in larger 16-player servers. Then again, lucky grenades are always fun :3
From experience being a previous server moderator, HL2DM servers usually never have more than 6-7 players at a time. This is quite different from the typical CS:S pub servers, where 32 or even 64 players sometime gather for a match.
If you want a larger map, try dm_tidal. I made that map with plenty of open space, and was intended for long-range fights.