Which AliExpress PSU brands are actually safe?

Great Wall is indeed a tier-one OEM that builds some of Corsair best units, so their own-brand PSUs (like the GW-ATX650BL) are generally solid and safe - just make sure you grab a model with full protection and Japanese capacitors. Segotep is a solid budget option; their GN-F series uses a reliable LLC+DC-DC topology, but I would skip the cheapest Aigo ones unless you are building a low-power office rig. For a gaming PC, stick with Great Wall or Segotep higher-wattage units (600W+), and always double-check reviews for a specific model ripple and transient response. Avoid no-name brands or generic Gaming PSUs - you do not want your new JGINYUE B760M motherboard to go up in smoke!