I've got the second one and it isn't bad. The one thing I don't like is that it punctures easily. It is amazingly versatile and the compact shape is great, however I never saw it as much better than a simple plastic diffuser on the flash.
I have also noticed that it darkens things up a bit more. As I have a 3.5 this is bad, definitely has caused problems. Once you get used to it though you compensate.
I haven't used the Gary Fong Strobe thing, but everything I hear is amazing. It is large and a bit unweildy looking, but the results seem to speak for themselves. I would consider it if you plan on doing event photography in mixed and variable lighting.
The Ito
Wicked. I think ill go for it :D