They are similar but :

The Twin Linear uses a dual, side-by-side, interlocked carriage design to
simultaneously control both the in feed and out feed fences.

While the Wonderfence is mounted on an Ultra mechanism.
The Incra Jig Ultra delivers the positioning accuracy needed for perfect
dovetails and box joints; the WonderFENCE delivers the offset and variable
throat capabilities needed for edge forming and shaping.


Blarg News wrote:

Hi Folks,

I would like to get opinions and/or feed back on the Incra Twin Linear
System (http://tinyurl.com/p9gr)
and their Wonder Fence Ultra (http://tinyurl.com/p9h1). To the untrained
observer (me) it appears they are very simular right up to the price. The
24" Wonder fence is about $50 more than the Twin Linear. What are the
differences? Is there a diffinate advantage of one verus the other.

Thanks,


ELAhrens