As above. Honeycombs channel the light in straight(er) lines, reducing spread. But their main function is to avoid flare, when in a backlighting or rimlighting situation, and they're invaluable for that.
2 observations though...
1. a well designed honeycomb 'eats' a lot of light and changes the character of the light.
2. that particular honeycomb looks to me to be too widely spaced to actually do much - a bit of a compromise between having no honeycomb and one that works well but changes the character of the light.
As for the softbox masks, IMO the strip one is a waste of space because the easiest, cheapest and most versatile method is to mask the softbox with a piece of blackwrap. The circular one though is a good idea, for when you want round catchlights.