Gonna go ahead and throw my review in here as quickly as I can just so everyone is aware of how great of a 1v1 experience this is so that it gets the attention it deserves.
I've been essentially a 1v1 exclusive player and forger since early on in Halo: Reach until now, and Bioshift is probably my favorite map I've played on in that time.
It plays a fast pace but offers enough room that a match on this map is almost as much of a thinking game on how to outmaneuver your opponent than it is a game of pure gunskill. Whether it be flanking or escaping with the teleporter system, trying to trap your opponent off spawn, or setting up on the upper walkway getting ready to teleport into the very risky overshield hallway, you have to be on your toes at all times.
The fluidity with which uncommon things like the goo pit and the top to bottom teleporter are integrated into the design make them feel like an essential part of the map rather than a gimmick of their own.
Really, I can't say enough about all of the amazing little nuances Longshot has worked into this design or I'd be typing for much too long, so just give it a try yourself.