Good illumination, but not fit to each flash

The softbox can be carried in your camera bag thanks to pop-up easily and is quickly ready for use. The lighting is really good - no harsh shadows, instead a softer Schattensaum around the subject.
But the Round Flash can not be used easily with any combination of camera and flash unit. I use a Nikon D70s with SB 600. The flash head of the SB 600 is too short to allow the softbox securely attach it to, or when it is fully pushed onto the flash head, the camera can no longer work properly and the sub-command dial no longer operate. Vario lenses can also be no longer operate properly because they are enclosed by the Gummistropps. To work with tripod and fixed focal length, it is OK, but freehand outweigh the disadvantages.
I have the Flash Round therefore - with a heavy heart - returned.