My Sinclair Spectrum worked for 6 months until it broke (damaged by a terrible accident, a friend of mine standing behind, watched my doing and opened simultanously a bottle of lemonade, it's content exploded and the lemonade shower killed my Spectrum immediately
) .
As terrible as it was, the Spectrum was a cheap used machine for me and already slightly outdated. I switched then to an ATARI 130XE with a complete different architecture and processor. Honestly, it was the better machine.
It was a mixture of hate and love with the Spectrum. The keyboard was terrible and the built-in speaker was simply to weak. I loved the rainbow on the housing and the fact, that a complete BASIC-command could be entered by simply pressing a button. I think the keyboard had in minimum 4 or 5 different function-overlays for each key on it. Graphics was fine (for that time and class of computer), sound awful, speed impressive. But unfortunally not really good software for the machine on the market compared with Commodore and Atari.