Just a quick test I did on the AE plug-in Kronos by The Foundry.
Didn't do anything other than a quick grade and adding Kronos and Motion Blur.
The first clip is slowed to 3% of 50fps and turned out pretty damn well.
Freaks out on the second clip - slowed to 30% of 50fps.
Third clip slowed to about 8%.
I found that it works best at the peak of a movement when the motion is at it's slowest.