Just a couple items from googling the brand. Essentially it directs gasses away from the shooter and as much out of the line of fire as practicable instead of toward them as in a conventional muzzle brake or flash hider.
"This compensator throws the blast forward instead of to the sides or rear. This makes it much nicer on the shooter & his buddies. Its only available for pre-bans however as its external diameter is 22mm (making it a de-facto grenade launcher). It also only works on threaded barrels."
"AR-15 Levang Linear Compensator
Designed to reduce a common problem with compensators, too much noise directed toward the shooter. Reduces muzzle jump without hurting your ears."
Wikipedia also has a nice write up on Linear Compensators under 'Muzzle Brakes"
http://en.wikipedia.org/wiki/Muzzle_brake