Quartz is Resistent Not Invincible.

Cambria counter tops are extremely resistant to chemicals, heat and scratching (just like granite). But, they are not heat or scratch proof and can be damaged by intense heat, prolonged heat from say a crock pot or certain chemicals and food products such as, wine, vinegar, tea, juice, coffee, soda, some fruits and vegetables if these substances are left to dry.

Cambria vs. Granite
It's All Marketing. Despite marketing efforts by makers of engineered stone to try and convince you otherwise, there isn't any significant difference regarding performance, function, cleaning or price between granite and Cambria or other brands of quartz counter tops.

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