I use flash on just about every image we take, minus the actual wedding photos inside the church. I agree with "tim" I can not stand LightSphere's I would rather go down to the corner store and buy a gallon of milk, make a cup of choc. milk and while drinking it pour the rest out down the sink, cut a hole out of the jug and stick it over my flash head. I would get the same results, cheaper and looks just as good.
Don't get me wrong the product does what it says, it softens light, but too much I want shadows in my photos I just want to control where they are.
I use an omnibounce, it softens it just enough to allow direction of light but not flash burn. However I do alot of bouncing and moving of the flash head while I shoot.
And please don' think this is Gary bashing, I actually think Gary is a great guy and one heck of a business man, one I am green with envy at his mad skills, I just perfer not to use this product for my style or art.