I've been intrigued about these diffusers since reading this post. I began reading what other websites and forums had to say about them. Most thought it was a really good idea but had not used one yet. Neil Van Niekerk's forum (primarily wedding lighting) was ambivalent regarding them. Said they don't work any better than other diffusers available and that the dome interferes with the camera's TTL system. Posters on DPReview seemed concerned about the dome blocking the TTL metering and making exposures even more inconsistent than with the other diffusers in the market already. I know that is an issue with some of the other diffusers that I've been looking at; such as the Lumiquest Softbox III. I'm not so overly concerned about that as others, especially in shooting herps at night in manual mode. It doesn't take much to regulate the light output in manual flash mode at night as it does in shooting just about everything else (especially on the move fill lighting, would not want to do that in manual flash mode). I would be using the diffuser for more than just herp photos, so that is a consideration for me.
How about an update in the near future on your working with that diffuser. I really like it in spite of what others have said, but I'd like to hear what your thoughts on it are after some good photo shoots with it, especially in TTL metered shots.
I have found that really large diffusers (12 inches or so) don't give very good results due to the lack of shadows. Shadows give dimensionality to photos.
I agree completely. The shot you posted is almost directly overhead of the snake (I don't know how it's oriented, it may be straight on) which would make it difficult to show any shadows of any type. In that situation you could try shooting the snake with the flash off-camera. I like the light and how it's diffused, I wouldn't want to change that at all, but by moving the flash to one side of the other it would bring out the depth and larger shadows from the snake as well as the texture in the rock.