I've gotten to play with the LCS app a bit when we had the LUG meeting demo. I loved it for layout control. It does ok for train running. The iCab app Lionel showed at York looks much better to handle running trains from. I can see folks embracing this technology.
I just like to be able to "feel" the controls so I spend less time looking at the iPad/iPhone. I'll still use the iCab but not as my primary controller.