Almost missed the second-last line in that screen-shot! Cloaking Efficiency 6!
That means that only 1/6th of a ship's displacement needs to be reserved for a cloaking device. That's still a bit too bulky for most applications.
When you consider that there is a tech line determining the MINIMUM tonnage of a cloaking device (currently: no smaller than 600 tons, which at 6-to-1 ratio means a 3,600-ton ship) I see two applications for cloaking:
1) Small-to-medium sized Fleet Scouts. These are not the "Explorer" type survey ships; they are operational scouts for the battle-fleet and are expected to operate in contested or even hostile star systems. The point of the cloaking would be to give them the same resistance to long-range fire that Fighters receive due to small size. The mission payload would be long-range sensors, so the cloaking device is competing for tonnage with a powerful sensor suite as well as with the usual ship infrastructure (life support, engines, fuel, hull, etc). Cloaking Efficiency 6 might be enough to support this design, although Cloaking Efficiency 8 would be better.
2) Gunships. A cloaking device would be a God-send to Gunships, which are exposed to enemy missile fire as they chase their targets. Unfortunately, Gunships require very powerful engines and weapons and accurate fire control, as well as thick armor. There just isn't a lot of excess ROOM in a Gunship design, and giving up 1/6th of the displacement to a cloaking device pretty well breaks the budget. We might want to wait another level or two.