The Spectrum was my first computer. I grew up in Latin America, where the Spectrum was popular, and I have such fond memories. BASIC is available within a couple of seconds and it has an incredible selection of games.
Speaking of games... I've lived in US for a long time and I'm intimately familiar with both the US gaming history (My dad had an Apple II) and the current gaming market. With this said, if you like videogames, you should absolutely try Spectrum games; not the conversions, which are generally poor, but the homegrown British games from the 1980s.
The Spectrum-centric, British gaming culture from the 1980s is the closest thing we have to a gaming culture from an alien civilization. I mean no offense to my British friends here, it's actually a compliment to its uniqueness. The Spectrum scene was very much like the current Steam-centric indie gaming scene, but with a particular British (let's not forget Australia and Spain) flavor that is hard to emulate.
So many homegrown games, so many small 1/2-people gaming shops, so many amazing gems unlike everything else you've ever played. If you are a serious gamer, you owe yourself to spend a few weeks looking into the Spectrum library.
By the way, you can get a taste of it in Black Mirror's "Bandersnatch" episode.