Strictly Business is a breath of fresh air after the last few custom campaigns I've played. With a heavy focus on strategy and macro over micro, ksnumedia delivers an experience for lovers of WoL-style barracks/factory terran turtling.
The early parts of the mission usually are the most critical. Being greedy and trying to focus on economy first can be punished, leading to a careful balancing act for the player. Due to the lack of enemy upgrades the base pushes tend to become an uneventful a-move, as you rip things apart with 9-damage marines. Mission 5 does offer a significant change of pace, and awards excellent use of control groups.
The story on strictly business is sadly a bit sparce. The first two missions are there just to pad up the mission count, and do nothing out of the obvious. While missions 4 and 5 trundle along on some cliche's with minor twists and namedrops, the story itself doesn't really kick off until 5x.
Verdict: Come for the turtling, stay for the turtling, all it offers is turtling