Where you absolutely refuse to go the cheap way.
For me its deodorant. Everything else I’ve found but my chosen brand fails me.
Disclaimer: my wife has a chronic neck injury.
Car! We’ve had Renaults for years, but last time we went for a BMW and the difference is night and day. My wife had to do lots of stretching exercises just to go and buy bread. In the BMW she can happily drive 5-6 hours with no (extra) discomfort.