Random things that have exceeded or fell short of my expectations:

⬆️good surround sound speakers 
⬆️robot vacuums
⬆️sous vide cooking
⬆️AirPod pros
⬆️quality knives 

⬇️iPads 
⬇️unpolarized sunglasses 
⬇️SendGrid
⬇️nonstick pans

cma.xyz. Founder /paragraph, ceo /mirror, previously at Google & Coinbase 

+1 ⬆️ for robot vacuums. It was the most exciting/useful thing ever bought for the house. 
In contrast
⬇️ for robot lawnmowers, current models are just not suitable for most houses in my country or too pricy