Gary Fong Cloud Lightsphere II
I recently purchased the Gary Fong Cloud Lightsphere II for my Nikon SB-600. After reading much of the reviews and seeing many sample shots and comparisons, I decided to try it out for myself. After taking a few shots, with the Lightsphere and without the Lightsphere, I found that it really does make a difference.
What sort of bugged me before is that I had to bounce light off the ceiling or a wall to get a nice and even distribution of light. While it produced very pleasing results, sometimes, the ceiling was either too high, or there was no available wall to bounce the light. I would then use direct lighting to illuminate the scene if there was no other available light. The Gary Fong Lightsphere was my solution. It distributed light evenly. It would surround the room with light and my photos looked like I took them under natural light even under low light situations. The Cloud gave me soft lighting and softer or minimized shadows. Performance-wise, it is all that I expected. I greatly recommend this accessory to speedlight users.
On the downside, it IS a bit big. I did get a number of people asking why I attached a margarine tub to my camera. A number of people also asked me what it did and why I had it on my speedlight. I got a few giggles here and there, but after explaining its purpose, it was fine. Another thing is the weight. My SB-600 pivots and tilts. If the speedlight is angled, the weight of the Lightsphere sometimes causes it to tilt by itself. Also, its size makes the camera feel bulky as it hangs on my shoulder or neck. Lastly, I had to turn up the power on my speedlight because of the Cloud effect. This resulted in shorter battery life. But, then again, I never go out on shoots without any extra batteries, so that’s ok 
Those negatives are more than negated by the difference in the photos. I like the results. It looks like I’ll be using the Lightshpere quite a bit. Highly recommended.