There’s 3 things that really stand out for me that I would say made a massive difference to my life:
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Cordless screw driver. Bought the day after building a flat pack bed with a crappy screw.driver that just shredded my hand. Thought it was frivolous at the time, but I’ve used it so much since. It’s light, small enough to fit in my pocket and good for 90% of DIY tasks.
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Tassimo coffee machine. Bought it 9 years ago, use it every day. Nice quick easy coffee. What’s not to like.
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My first DSLR camera. It was a Nikon D50 back in 2005/6 and it sparked my interest in photography to this day. It gave me a hobby I can take lots of places and do it alone or with others. I never loved the D50 camera itself, but I did get some really nice shots with it
HP48GX scientific calculator, damn old, still works great still use it a lot
Steam Deck, handheld gaming computer, barely use PS5 anymore, this one is so quick and convenient to just pause and resume games and take gaming everywhere and the SteamOS Linux is awesome. I use the desktop mode with full KDE Plasma desktop as my portable computer a lot when on the go. Also with the dock station I can use it as a gaming console when going on holidays.
And the flat I live in. Good thing as I bought it quite a few years ago since the home prices are just criminal and highly unjust now. This stuff does not belong on markets to be sold for profits or some criminal short-time renting crap like AirBnB