[Paddlewise] Hull Shape & Stability

In response to previous post on a Frenzy I went to the Ocean Kayak site to check out some sizing info.  While there I wandered over to their kayak design section  and found some info on hull shape. My reading of what they wrote was 

Flat bottomed kayaks are less initially stable in flat water than V bottomed kayaks.
Flat bottomed kayaks have more secondary stability than V bottomed kayaks.
Flat bottomed kayaks are more stable in surf than V bottomed kayaks.
A "U" shaped bottom is equated to a flat bottom.  I would think "U" would be a rounded hull and be more  on the other sided of stability from a "V" hull rather than same as a flat bottom.

This does not seem to go with what I remember reading about hull shapes.  Is my memory bad, did I mis-read what was on the Ocean Kayak site, or is their information contrary to conventional thinking.?

Would appreciate any thoughts on the matter.

Note: I was going to copy their exact comments into this message, but did not because of potential copywrite problems.

Mark J. Arnold
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