Last year I bought a new second remote and several cradle/wheel assembles. Last week I bought a second TIU new from The Railyard in Ronaoke VA . I also have the stand alone WiFi but prefer the remotes but have used the app on both my phone and iPad. My granddaughter has the app on her iPad and loves it. So yes I would by another TIU and remote just to have them. I must say my current TIU and remote I bought shortly after MTH introduced the system and have had no issues during that 15 or so years I have been using the first 10 or so was with 2 PW ZW’s.