One thing I have learned from JT is that it isn't the AMOUNT of light you work with, but the QUALITY of that light. For me, one of the more difficult light sources to work with is on-camera flash. Using on-camera flash inevitable. At one time or another we have all used it as a primary source or as a fill, and I will wager most of us haven't been pleased with the result.
Here's a snapshot of the receptionist at my office - straight on on-camera flash shot with a D70 and an SB600 using TTL.
Even with the camera's computer controlling the output, the quality of the light isn't great. So what do we do? Well, one of the techniques I was taught is bounce the light off a ceiling or wall. So I did. Same gear as above - D70, SB600, all TTL:
A little better, certainly softer and no hot spot on her face, but there are distracting shadows under her brow and even her chin. In the studio, I could fix this with ease, but this is an on-camera flash issue... What to do??
How about this? Again - D70, SB600, TTL, flash in the bounce position:
I like this shot MUCH better than the other two. What made the difference, you ask? This thing did!
This is one of the few gadgets that has lived up to the hype.
Here's a shot with the LightSphere in place and shot straight on - no bounce:
I haven't put it through a lot of work yet, but so far I'm very pleased with the result. For those times when you absolutely positively must shoot with on-camera flash, this is seems to be an indespinseable tool.