The Wondercut looks similar but I don't think you could use it with 2.5 strips
although I could be wrong.
The Easy Angle and the Omnigrid 96 includes the 1/4" seam allowance.
You are not cutting a perfect triangle but more of a quadrilateral but
still end up with a 2" HST.
In order to make a 2" HST you usually have to cut 2 7/8" or 3".
With this method you can still use the 2.5" strips and have 2" (finished) HST.
That's the point I was trying to make. :D