Hi Joe,
I don't have the same experience with flash because our backgrounds and skin tones are not all the same when flash is used. We also do not have a photo studio but an office with a large window so it's almost impossible with flash or no flash to produce exact same shades and tones. This is even true for the same round of pictures taken at the same time. If you look closely at all the before pictures in this result, each shade of the background is slightly off. There's a bigger difference between the two days but know what I mean. You can try to minimize the variables that go into each shot, but you can only do so much whether flash is used or not. Just my opinion.
This is a nice SMP result that I'm sure he's happy with but I have to say my initial reaction was "wow, that's an aggressive hairline", then it's "okay, it's only temporary". You're right, it's only possible to enjoy a young hairline with his aggressive hairloss with the temporary technique. I like the new trademark name, it's somewhat Jotronic'ish. Did you come up with the name?