David Strike wrote

> People who use and prefer a heavier and more rigid bladed fin - like the
Jet
> Fin - would probably take a hell of a lot of convincing before switching
to
> any other type of fin.  But of all of the new fin designs that have come
> onto the market in the past few years, the Twin Jets certainly outshine
most
> other models that I've seen and used.

This is a most timely post.  I'm considering purchasing new fins.  My Mares
Plana Avante TRE fins have been great, but an upcoming diving trip has me a
bit concerned.  My fins are not new and, because they are full foot fins, a
failure of one ends it's useful life.  The only way to "save a dive" with
these fins is to carry a second pair.  So, for the first time in my diving
life, I'm considering purchasing foot pocket/strap fins.  This brings me to
my question.

I like my Mares fins very well.  Advertising suggests that they are 15% more
efficient than "standard fins," whatever that means.  The Quatros are
reportedly 20% more efficient by the same nebulous standard and are
presently my first choice for a new fin.  The split fin technology, however,
is new and possibly better still.  Lacking the time or the opportunity to
try out the Twin Jets, I'd like your opinion on the merits of the Twin Jets
versus the Mares Quatros, assuming of course, that you've tried both.  My
normal dive is slow and easy, but there are times when power and speed are
essential.  So far, the Mares fins have done fine, but I don't want to limit
myself to them if there is something better.  I'm particularly interested in
the effects of the vents as well.

Lee