- round catch-lights in the model's eyes;
- tight light control, just like a softbox;
- about $30 for two!
- more than adequate fit and finish;
- extremely fast setup - front diffuser is permanently stitched to the umbrella, so all you need to do to set the softbox is to open umbrella and install the flash;
- full access to flash controls because only the head protrudes into the softbox.
- light emitting surface is flat thus making light more directional than shoot-through umbrella.
- When used bare, flash hot spot is way too prominent - I had to use a snap-on diffuser to achieve adequate light uniformity. As a result almost two stops of light are lost.
- The stem is unnecessarily long and I almost poked my model when I tried to position the softbox close to her face. I then had to cut off 5" of the stem.
- (minor) the stem is round - I really like an octagonal shape of the 43" double fold umbrella which prevents it from rotation.
Right before I published this summary I found this video review.
Edit: Check out Zack Arias' Shoot Through Umbrella vs. Softbox