I have been very pleased with the slow motion capability of my FS700. In day light or other proper lighting situations it has been amazing.
I have also been experimenting with methods on how to reduce flicker in bad lighting conditions when shooting in slow motion mode. In this example, I was recording at 240fps. You will immediately notice the flickering.
So I sped up the original footage to 200% which appears to have reduced a lot of the flickering and then took that footage and reduced it by 50% to get back to the original speed (played back at 24fps or 10%). I used Twixter in FCP 7.
FYI, i have just posted a new test using FCP X only, without the Twixter plug in. Interesting side by side comparison vimeo.com/111673634