For cycling there are now a group of trusted companies that many people purchase from - WinSpace, Magene, iGPSport, that stand behind their products.
I have a Magene p505 crank-based power meter - £250 delivered. It's as accurate as ones costing 4X as much, and has not shown any signs of issues in the year+ I've been using it.
The idea that AliExpress is just for cheap tat is less and less true, and products in certain sectors coming out of China are just much better value for money (and often, as good as, or better quality) than you'd find from homegrown companies. For cycling, especially Carbon Fibre parts, this isn't surprising - the sheer depth and breadth of composites knowledge from years of making bikes for western brands has paid off handsomely.
