Urban Decay Backtalk is a neutral mauve with a satin finish that is discontinued and retails for $18.00. In comparison, Estee Lauder Tenacious (527) is a cool mauve with a cream finish that is permanent and retails for $32.00.
Estee Lauder Tenacious (527) is 90% similar — it is less shimmery, darker, cooler, glossier.