The following topic might also be of interest:
We should also note that the Jasco switches and the GE switches are the same, Jasco makes the GE line.
That said, the Jasco/GE models except for the 45612 have been discontinued by the manufacturer, and will likely be difficult to find. The newer models do require a neutral.
Cooper, however, is still making theirs, but it is only guaranteed to work with incandescents.
http://www.homeseer.com/compare-z-wave-dimming-wall-switches.html