It's a fact that computers become obsolete faster than you can say Z80. However, many people, including myself, consider ourselves experts in these ancient machines, sometimes referred to as silicon antiques.
My interest started in the early 1980s, when I was introduced to a machine which I thought was quite fancy at the time. It was a Sinclair ZX81. OK, by today's standards, that does belong in a museum, but it did act as a worthwhile introduction to computing. Of course, the first proper computer I had was a Spectrum. I expanded it greatly, and still have one in working order now! However, I don't use it much, partly because I can emulate it on many systems.
Anyone with as much interest as me would surely have had opportunities to try out other machines. Well, I did. I don't think anything quite matched the Spectrum for speed of operation or simplicity of use. Even BBC micros appeared to have some strange programming quirks! I did briefly have a Commodore plus/4, although it was pretty useless with no storage device.
The Spectrum still has enough following to have a web site - World of Spectrum.