A new LG OLED TV. I usually don't buy into hypes, but I got a great second hand deal on a 55" OLED and it has BLOWN me away. It's picture quality is insane. If I could only watch 4K Planet Earth on it and nothing else it would still have been worth it.
I also bought a $200 robovac by Xiaomi, which is really convenient, especially if you have pets.
Based on experience I will probably also splurge on a new MacBook is they release the rumored one with ports again.
OLED is expensive, but it's definitely worth it for movie watching.
I upgraded from a 10 year old 42" 1080p LCD to a 65" 4K OLED and it's so damn nice. Darker scenes in TV/moves are so much clearer without a backlight shining through everything and washing everything out.
I also bought a $200 robovac by Xiaomi, which is really convenient, especially if you have pets.
Based on experience I will probably also splurge on a new MacBook is they release the rumored one with ports again.