I first heard the LS3/5a (the first, 15 ohm version) when I lived in London in 1979 and was much enchanted with the sound, though I didn't buy a pair. Fast forward to 2022, and I was considering a set of the current Falcons -- I just didn't have enough faith to buy a pair of the used originals, especially at their current prices, as things do age, and there is always the question of who did what to them during the past 40+ years.
However, I ended up stumbling across a mint pair of year-old Spendor 4/5s that I got at a great price -- $1,500 instead of the $2,800 list price. They have all the magic of the original LS3/5a speakers, but with far superior bass and dynamic range. If I was limited to a single pair of small bookshelves, I wouldn't hesitate to base my only system around these.