Everybody here seems to have better luck than my experiences. I really wanted to like the Hogwarts Express RTR set, but I have had bad experiences now with three different sets manufactured at different times and all NIB (two shipped directly from Lionel in NC). The family likes the Harry Potter theme even though the consensus is that the sounds are not that impressive. I very much like the LionChief concept since you can just apply power to track and use a remote. However, I had problems using the app on both apple and android devices for anything other than basic controls.
The first set had missing screws and did not run properly. The second set no chuffing sounds. Third set the locomotive just stopped working before making it 1/4 around the track and also had parts falling off of it in addition to some minor paint chips that were never touched up (and also a missing screw by the pickups). Eventually got the third set to get going again at one point, but not very confident in it with metal and plastic parts falling off. Poor sound quality overall and constant derailing of last passenger car around an 036 corner causing short (cars too light?). If it were easier to upgrade the drive train and the command system, I might not mind so much and would invest more for a better product, but it seems like upgrading and maintaining these is for serious enthusiasts.
Glad the majority seem to have better luck and the skills and patience to fix and improve when necessary. Maybe I will save up for LionChief+ or something.