After I got it I spent some time experimenting with it. This room had a 10' cieling, shot with my 550EX on a Canon 20D with it pointed straight up. Manual mode, 1/125th f/2.8 at ISO100
Outdoors, pointed forwards with the dome installed and some very uncooperative subjects. 1/50th at f/4.0 at ISO100, same camera/lens as first one.
Indoors, large group, trying it out there not sure if I'm happy. Seems to not get near as much of the room as it claims too. 10' ceiling, roof is white, the wall color might have had something to do with the light fall off. Canon 5D, 1/160th, f/8, ISO100.
I do feel a bit snake oiled with the video on the website vs. the instructional video that comes with it. The video on the website is edited. The first shot was AV mode on the camera, then he flips to M mode on the camera. On the canon he was using this changes the way the flash works (fill vs. main light) and I felt it was misleading a bit in that iit looks like he just fired without, then with and the difference was blatant.
I also have the Joe Demb device (
http://www.dembflashdiffusers.com/ ) but haven't liked what I get from it, light seems too harsh. I've not played with it as much though.
Prior to these too I had used some lumiquest promax velcro on big bounce/pocket bounce/softbox things but never liked them. however I need to re-use them now and test out since I've figured out on camera flash better than I used too. I think my disappointment was more in my skill with the camera than the light modifier.
YMMV, you may think it's a scam, dunno, it works as advertised to me and I'm not really handy at the DIY thing so it didn't hurt my feelings to spend $49 on one.
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http://public.fotki.com/trekkie
http://www.thescribeoflight.com