As usual, I'm late to the party, but I wanted to add my two cents. I own a set of ShackMan's lights (my second set, actually), and I couldn't be more pleased.
I prefer them to the Tk409 version for a couple of reasons. Having a darker LED base makes the 'background' easier to subdue behind the tinted plastic of the chest plate. And to me, they are just the right brightness.
Here's a video comparison of the two (ShackMan on top, TK409 on bottom) that Evan4218 and I shot about a year ago, complete with a complimentary karaoke background soundtrack:
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