Sorry to butt in here, especially as my first post. But that above comparison picture of the prop photos and MFX photos. The MFX colour under flash, looks closer to the actual prop without flash...
I disagree, I used the eye dropper in photoshop to get an approximation of the colour in each photo. I tried to get a spot on each sonic that was best representative of the real colour in those lighting conditions and as you can see the MFX sonic is much closer to the prop with flash than without flash. It's not a perfect match but it's close enough that it looks like lighting is the culprit for the minor difference. Here's my comparison:

mfxreplicas has got a free drink on me as well next time I'm in the UK. Threads like these make the people who try so hard to provide us with these great replicas wonder if it's worth the hassle. Too bad I can't afford one of these because if I could I'd happily buy it off one of the nay-sayers here.