Thanks for the reply, H1000. I'm in the process of getting a DCS system for a new layout I am building and want to know what I really should get. Most folks I've talked to say the app is much better than the remote (and I do like the look of the app from the demo's I've seen). I suppose I can always do the PS1 programming on a test track...
Right now, I have 3 PS1 engines, 1 PS2 engine, and a few postwar Lionel engines. One of the main reasons I want DCS is the ability to walk around the layout and still control the trains, and to easily activate all the Protosound features (compared to separate bell switches for my ZW, etc.).
I do know I'll need to get some fast-blow fuses or breakers if/when I get the TIU and use my older Lionel transformers as the power source.