[SeaCliff]

A couple of articles on the S stroke:

Any thoughts from the swimmers amongst us?

http://sundaytimes.lk/090823/Sports/sp_07.html

http://www.surfscience.com/topics/surfing-tips/intermediate-tips/learn-the-s-stroke-and-catch-everything/

I'm all for anything that makes me paddle more effectively/efficiently. I'm slow as molasses.

[Dorado]

I use it when I'm trying to cover some distance to get to a peak , or when paddling hard against a heavy current running . As far as using the s stroke and paddling deep Unser my board to catch a wave usually not

[theusername]

I find the S stroke to be useful, but the most useful thing I learned from swimming is how to initiate my stroke from the core. Without that I find everything falls apart and is likely the cause of a lot of surfers' shoulder pain. 

[the Kook]

I am a weak paddler and use it all the time since I need every bit of help I can get.

[little_nasty]

i use the S stroke quite a bit.  But a bit less than i used to.  You have to be careful about your shoulders if you're going to do it.

[Shacky]

i've been doing it naturally for years.  just took notice one day. i would definitely say it's helpful.