There's 3 things that really stand out for me that I would say made a massive difference to my life:
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.
Tassimo coffee machine. Bought it 9 years ago, use it every day. Nice quick easy coffee. What's not to like.
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
My horse, Lola. She’s an amazing 9yo grey quarter horse mare. “Retired” barrel racer, she’s the perfect trail/ranch horse. She’s got the best quirky and silly demeanor, she loves to hang out, and she’s playful, but never gets crazy under saddle.
My guitar. 2012 PRS 513. I absolutely love that guitar, and it got me back into playing after almost 20 years off. It’s my “do everything” guitar, and the difference in sounds between pickup combinations makes it incredibly versatile.
A good mattress. I spend a solid 1/3 of my life sleeping (or trying to) and a great mattress helps so much.
I have 4 also, but 4 separate manufacturers. I've run out of wall space to hang them so I have to think quite carefully about my next move as one will have to go.