Where you absolutely refuse to go the cheap way.
For me its deodorant. Everything else I’ve found but my chosen brand fails me.
Headphones. I first used some cheap ones and then switched to Bose. The difference was significant. Never again cheap headphones… Also my ears thank me because I can listen to music with lower volume than with the cheap ones.
Oh Bose? I mean it can be an upgrade, but wait until you buy actual good headphones.