Are Skar, Taramps, and Rockville amps as powerful as their labels claim?

Independent amp-dyno videos referenced by reviewers consistently show Skar amps hitting at or near their RMS spec, Taramps slightly over their RMS spec in some cases, and Rockville and BOSS-tier amps falling well short of their advertised 'peak' or 'max' figures. Treat 'peak' wattage on the box as marketing and look for dyno-verified RMS at the rated impedance.