Its pretty much the same in my view.
As long as you focus on posture, breathing and ensure you do all the usual movements with a normal jump rope, i.e. wrist movements etc then you'll get the same benefit as with an actual rope.
In fact, there are ropeless jump ropes on the market which count the number of jumps etc etc which may be of use?
http://www.household-gadgets.com/ropeless-jump-rope.htmlCDH