Apple Watch is also well-designed. It doesn’t try to do too much, and every feature has become well-implemented over the years. For example, it used to be a slow and annoying process to load music onto it. In recent watchOS I never have to think about it, whatever I’ve been listening to recently is there automatically and ready to send to my AirPods. But the feature I use most and which was the reason I bought one is Apple Pay, specifically that in Japan it supports mobile Suica for riding public transportation. Since the underlying technology for Apple Pay has been used in Japan for a long time, many businesses including almost every convenience store and even some vending machines supported it out of the gate.
“Helper” brand 65W USB-c charger. I can’t find it online anymore, presumably because it’s unsafe like many chargers. However, for $30 it has 1 USB-c port, 2 USB-a ports and compact adapters for most countries’ power outlets. It works for all of my devices including Nintendo switch and it’s dock (it uses a voltage which is often not implemented in USB-c chargers). I have 3, for home, work and my bag.
Raspberry Pi. It has some annoyances and I wish the design itself and processor selection was different. But, it was cheap enough and popular enough to arrive at the end result of amazing community support.