I have noticed the image on the AVIC411 website shows the button flush to the unit. Am I missing something or is that not on the F90?

The only one with a flush mounted knob is the F500BT. But the picture in the banner at the top, the unit has a SD card slot. So I'm guessing that it could be an early prototype picture of one of theother F-series units or something. Because the F700, F900, and F90 all thave the protruding volume knob.

I noticed that too. But I think the story is that the originally-released photos of the unit were straight on. I think the site guys took tht photo and made it 3D-looking by rotating it.

^ good point... it does look like it was a straight on picture that was just tilted using photoshop or GIMP or some other pic editing software. That would be the most likely reason.