I think they hooked up these test PSU's to the National Grid to get that effect.
Pity they did not identify the culprits
Could have been any make and maybe even some of their own "surplus to requirements".
I agree. Until recently i never really gave the PSU much thought in my system.
When i recently built a new high(ish) end pc i fitted a Coolermaster Real Power 1250watt PSU. The cost was pretty high but well worth it as it has a lot of features.