I’m 45 years old, and have spent the last 20-odd years searching for speaker Nirvana, and finally found it a couple of years ago when I got my first ever Harbeths. They exhibit just a beautifully, perfectly flat EQ from bottom to top, which means they are incredibly relaxing as no frequencies are harshened in any way.
I could only afford the smallest model at the time (P3ESR) which doesn’t go much lower than 75Hz, so a sub is essential. But with the addition of a sub I have * almost * all I want. The only time I find them lacking is with large scale orchestral classical music, due to their small size, but for everything else - rock, jazz, folk, etc, they are perfection. They reproduce acoustic instruments like piano, guitar and voice with extreme accuracy.
Oh, and a major factor for me was how good they sound at neighbour-friendly listening levels. You don’t have to blast them to make them "come to life."
With a bigger budget I would have gone for the M30.2, which will be my next upgrade, but I’m in no rush with the ones I have.