I have 2 and use them both. They are both are over 15 years old. One, however, was sent by me to MTH twice in 2 years as it failed twice. MTH fixed it both times for free.
Tough call. I don't worry because I have 2 and now run DCS. But I'm buying a second remote and am considering a back up TIU. As I build my new layout, I will connect the Z4000s together for twice the DCS power. Dave at MTH suggested that at a show to me.