Really high quality Source mod, it's arena shooter multiplayer but much more approachable and appealing. Good community servers and mappers means you'll always be seeing new stuff. Flamethrower feel out of place but they're working on a replacement as far as I know. Has a extensive options list for HUD and FOV which is helpful for an arena shooter, and cosmetics really let you personalize your merc. I'd say try it out since there aren't many other mods with as strong a presentation than Open Fortress.