Raidbots strongly advises against using stat weights - they are an outdated tool and often result in sub-optimal results. Using direct sims of actual gear (like Top Gear and Droptimizer) is a vastly better approach. Read More
Results are only as good as the SimulationCraft model for your spec! Check other trusted sources to figure out if your spec is well supported and/or dive into SimulationCraft itself and get involved!