It's exactly like the small octa except the beam of light is narrower.
For example, if a photographer uses it as a mainlight on a subject there will be less light spill on the background since the beam is narrower. The deep throat is more efficient than the small octa for projecting soft light at a farther distance.
Elinchrom's quality is very good. Simply set up the softbox and fold it into the case like an umbrella. Setup is reallly quick once you get used to it...Remember, softboxes are just another tool. Eventually they wear out just like everything else. I don't think Elinchrom is any better or worse than the other quality lighting manufacturers.