I practiced SFQ for a few months, and then I saw a DVD by Francesco Garripoli called "Qigong Beginning Practice" that contains Swimming Dragon and about 20 or so other Qigong movements. I loaned my SFQ package to a friend of mine for the summer so I've been using Garripolli's DVD since June. I'll be getting the SFQ package back from her in a few more weeks, at which point we'll switch again.
All told, I feel physically better after Garripoli's DVD because it's a more comprehensive set of exercises.
This is important to note that we should find a form of Qigong or Tai Chi or any form of energy work that resonates with our system and stick with it to get full benefit.
JEFF