Bigger, Heavier. Works, but not as well. I way prefer the Merlin.
In general Sachtler, thoguh they have veyr high quality stuff, seem to have sligthly missed "something" with their range of stabilizers. I can't quite put my finger on it, but they just didn't work quite right when I tried them at IBC.
They make the best Tripods, Heads, and Pedestals available. (My fave to work with.) Why they decided to make their own copy of the Steadicam I do not know.
I think Sachtler's came first...anyway, I've seen marketing materials and articles dated 2004. It actually was introduced in 2003, I believe.
What appeals to me is the quality...from the photos, it looks like it could survive a bomb blast. I guess that's why it's heavier. Mikko, did you try the miniDV Artemis that looks like the Merlin? They have others that are more expensive and look more like the Flyer.