In theory, you would use them most any place you would use a non-centercutting end mill, within the limits of the flute length. I don't really like the way those inserts are held, with the edge parallel with the axis. it would hammer quite a bit if you tried to cut at full depth. You cannot spot face with them. In the CNC world, you program a spiral plunge that avoids the need for centercutting while machining pockets.
In reality, in my experience, you are limited in the DoC to about 300% of the insert radius. But for light surfacing work where a fly cutter isn't practical, or available, they work fine.