Roundworld's Bergholt Stuttley Johnson
Almost every Sinclair Product had a touch of genius but fatally flawed. If the design didn't have a flaw then it would be a failure due to poor production (Amstrad was horrified at the Production when he bought them).
Micro Smallest Radio (which wasn't even before it came out). TRF Reflex.
Grossly exaggerated specs of sub spec IC10 (Plessey) and IC12 (Texas)
Watch almost impossible to fit in case
Three iterations of pocket TVs with different flaws (oddly the first one the main flaw was too expensive, rare for Sinclair 2nd flaw battery. Last model was obsolete at release by LCD and Sony had better "flat" CRT to market first).
Wobbling RAM packs
QL "tape" cartridges
C5 bike using Washing machine motor.
We need people like Sinclair, but with better attention to Production Engineering and Quality.