Until I tried the 40 cm Lessacher Formula Duo Weed, I was very skeptical as well.
Now that I have many hours sailing on this fin, I understand.
Yes, it gives the same lift as a larger foil.
Yes, its short for a formula board, but any weed fin on a formula board will feel quite different
that and 65-70 cm vertical formula fin.
The Tangent Reapers should be available at Southport Rigging in Kenosha, WI and at Wind NC, in Avon,
Hope this helps,