The ZX Spectrum is an 8-bit personal computer developed and sold by Sinclair Research in the UK on 1982-04-23 and later sold throughout Europe. It was designed to be very low-cost which resulted in it being technologically inferior to most of its competitors, however, by being about a quarter of the cost of the Commodore 64, it appealed to a lot of people and allowed the computer to sell well despite its limitations. Several upgraded models of the computer were made until the last were released in 1987, but new software continued to be made for it, and the hardware was supported until 1992. The computer runs a Zilog Z80 and the Spectrum 3 included an AY-3-8910 audio chip.
I do not own, nor have I ever used a ZX Spectrum. But I have used some of its software in emulators.
I don't know enough about the ZX Spectrum to review it.