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Right now, Profile Design's T3 + Carbon ($230) is the best clip-on going, full stop, bar none (pardon the pun).
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These extensions, reminiscent of the now-defunct Blackwell Wrist Relief (a John Cobb idea), is the gold standard for extension shapes.
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Bontrager's Race X Lite Clip-on comes darned close to being my favorite. It just needs a pedestaling system like that used in the Profile or Zipp system. Notice the Wrist Relief style extension shape?
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Zipp has done a nice job with pad and pedestal configs for its very nicely priced Vuka Alumina Clip.
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This is an aerobar stand I made for our fit workshops, to show retailers how aerobars might be displayed so that a customer can bend over at the waist, move from one bar to another and test what's comfortable. Good bars will pass the "palpate" test, executed in a fashion such as this.
