Originally posted by a.seki Question is, are these products worth it? Or should i go for DIY alternatives (please give some recommendations)?
Sure, if you are shooting indoors with normal height ceiling and relatively close walls. The whole point of the attachment is to simulate a bare bulb and bounce light off of every nearby surface.
That is what makes the light very soft, having it come from the walls and ceiling. If you shoot with the flash pointed directly at the subject, with nothing to bounce off, it won't be any better than a flash with nothing on it, except that the attachment is going to eat 1-2 stops of light.
Using it outdoors doesn't do anything for you unless you are using the flash to trigger other flashes wirelessly/optically.