Bye-bye Uncle Clive.
Another one of the ZX Spectrum generation here. A ZX Spectrum 48K was my Xmas pressie in 1983, followed by an Alphacom 32 printer the following year, then a ZX Expansion System (Microdrive bundle), then a QL (after Amstrad reduced them to get rid of them). Knew of Sinclair some time before that though - my dad had previously bought an Oxford calculator (also reduced to clear, ISTR). One of the LED segments died, and when he sent it off to get fixed he got a Sinclair Enterprise as a replacement (which I still have). Three years after unboxing that Spectrum I had decided to study computer science at uni. Still not sure if that was a good move ;-)
The Spectrum was definitely a product in the right place at the right time - just enough capability for decently playable games, and significantly cheaper than the competition.
I suppose Clive's approach to product development could be summed up as an obsession with cutting corners, bending rules and taking unorthodox approaches (e.g the ZX Printer, Microdrives, weird keyboards, right-angled CRTs...), all to cut costs to achieve attractive price points. For instance, the serial ports on the QL are an astonishing feat of bodgery, just to avoid using conventional UARTs.
Of course, in the fast-moving days of the 1980s, sometimes the mainstream technologies would catch up pricewise by the time Clive's alternatives hit the streets...