Hi Tweek
After so many experts said that omnibounce is totally useless, I was hesistant initially to give you my views. Anyway, I am no expert in flash photography, (in fact, I am just an amateur photographer) but just want to share about my experiences.
I have tried other ways of softening light from the flash, including bouncing off ceiling, using a bounce card (with crumpled aluminium foil), DIY crude "omnibounce" using plastic milk bottle, etc. I would say some of those methods do give quite good effect if you do it correctly. However, I purchased an omnibounce recently for a simple reason: convenience.
I use my setup of S602 + 285HV basically to photograph my baby son at home. With the omnibounce, when I want to take some shots of my son, immediately, I could put my flash on the camera, snap on the omnibounce, on the camera, and I am ready to fire off. I also don't have to worry abt it dropping off in between shots (my DIY one drops quite easily).
Also, when I am shooting indoors at other places (say at weddings), I don't think I would ever use my flash with a bounce card or my DIY omnibounce ... sure look very wierd ...
Essentially, to me, the $28 spend on the omnibounce is small price to buy the convenience I need for the portriat shots I take.
I have posted some photos recently. Those were taken using S602+285HV+omnibounce. Take a look:
http://forums.clubsnap.org/showthread.php?s=&threadid=9886
Azone has also posted some test shots using a similar setup:
http://forums.clubsnap.org/showthread.php?s=&threadid=9273
PS: Again, I must say that I am no expert in this subject matter.