I wrote a review on the GF a year and a half ago. I don't know what happened to the pictures but I must have deleted them. sorry. That review is here:
I gave it a pretty good review then, but I feel I have improved my photography a lot since then and I wouldn't give it as high of a grade now.
Since then, I have bought a set of 3 StoFens, white, gold and, green and a westcott shoot through umbrella.
The gold and green StoFens are so you can balance the flash light with the ambient light. With the gold I can set WB to tungsten and have a balanced light from my flash when in a tungsten lit room. (The green is a waste btw don't buy one. Floro Lighting is much more daylight balanced now then when they designed it and is more or less obsolete from my experience so far. Even when WB is set to Floro, it overcompensates to ugly green with the green StoFen.)
The off camera with the umbrella is my preferred method at home now. For $25US + $15US you can have a umbrella and a umbrella adapter which is about what you pay for the GF. Another $30US for some ebay triggers + $35 for a light stand (I use an old tripod I had from film days) and you are off camera strobin it.
When I don't want to take the time to set up off camera lighting or when I am walking around, I find the StoFen's provide nearly as good lighting as the GF and are much more portable. They travel more compact and they don't fall off the flash ever. Not to mention how much more stealthy the StoFen's are compared to the big bowl.
I haven't ever used a lumiquest softbox like Citruspers suggested, but I can definitely see the advantage of one. Both the GF and the StoFen's scatter light all over and having a softbox on flash would help with directing flash.