Strange stuff, but works!

I use this diffuser on a SIGMA EF-530 DG ST.
It fits perfectly on the flash, makes a strong impression: the diffuser can be tens of times on and take off, because probably will change nothing in the perfect fit. On this point, the Bouncer is reassuring for me.

Unfortunately, less positive is the haptic impression of this particle: looks like a transport lock of an electronic part, which is facilitated throws away when unpacking.
Well, then listen to halt the elegant design briefly above the flash shoe of the camera on, and above perched minimalist functionality. The main thing, the flash is soft - and confirm the first test shots.
Works great, looks just a little off poorly.