[15 x 15 x 0.5"] On a Litepanels Astra, this works very well.  Easy to install.  No need to collapse and twist to pack away, just collapse and store with light.  Two medium binder clips to secure the velcro straps is a nice carry along.

[Silver] This softbox is super good... once you learn how to put it right.
This softbox comes collapsed and will pop-up when you take out the zipper bag (like light reflectors). The supporting rods are magnetic and the construction is very good.
When you out it on your light the first instinct is to slide it over, doing so the light will be inside the box as it's not intended to use...
You should align the flaps and set them with the velcro tabs, once done, the softbox will sit in front of the light doing diffusing the light correctly!
Works great on most 12 lights, I use mine on a Dracast 728B. Works great but with the softbox on I lose the ability to tilt the light.
The only cons: the container bag doesn't seem strong enough, specially the zipper, I have a feeling it won't hold the softbox inside for long.
5/5 stars because I really loved how fast is to set this up.

[1.05 lb] This is a great softbox got my Aperture lights.

[15 x 15 x 0.5"] bigger size and easier to use them.

[1.05 lb] Great product! I had this AHA moment of adding a softbox to an already
diffused LED light (Godox). This is when I realized what was lacking to
make my video conferencing stand out (I am a therapist, and part of my work involves teletherapy). I may be wrong, but this is the only softbox for rectangular LED lights. It is straightforward to install and use.

[Foldable] It is an amazing light for the price. It is super bright. Shadows have some weird patterns if diffuser is not used. Also you can't tell which diffuser is half or full.

[1.05 lb] We use these small softboxes to diffuse the lights in front of people and product, provided they're less than 10 feet away. Even at full power, they do not adequately light things.

Great product! We love them for their specific use!

[Foldable] No light leakage from sides. Would buy this again.

[Silver] I have this cobbled onto a Generay Mini-Moon with the optional egg crate. I found the Mini-Moon's build-in diffuser was not adequate for my lighting application. It is not the intended use of this softbox, of course, but it works superbly for this, the 8 distance from the light to the scrim really helps the LED panel a lot, and it is still plenty bright through this. This would add a much nicer light quality to a variety of small LED lights. It was a fine value here at B&H. 

Like most collapsable softbox/diffuser products I have encountered, am not sure how many collapse/deploy cycles they would realistically stand up to. It takes a lot of force on some very thin fabrics to fold it back up and then stretch it out again. Long term durability concerns aside, the little magnetic standoffs here are clever, it deploys super-fast, and it fits into a small bag.

This is a great product if you want to improve the light quality on a LED panel, and it helped me tremendously with my small studio space where the light is closer to the subject than I would ideally want it.

[Silver] I have the Aputure LS 1/2 Lights which are 12 by 4.5. The Angler Softbox is made for 12x6, however the design is excellent and it fits snug and securely to my lights. The magnetic system of extending the depth of the Softbox is innovative and also works very well. So much nicer than fiddling around with the typical metal or plastic internal poles found in most softboxes. The Grid is also easier to install than most other softboxes and works well.