Hmmm I guess it would depend on your needs. Last summer I can feel the heat emanating from my windshield with OEM20 (43C outside temp). But I dont feel any heat from the windows with OEM05. Aircon settings that time was 26C blower 2. My aircon cools the cabin faster even when parked outside. Yun nga lang, when maneuvering or parking on unlit spaces, I sometimes have to roll the window down. Thats the tradeoff. I dont have a hard time driving at night even on stock halogens. Ang problem is yung twilight, when it start to get dark and even when you turn your headlights it doesnt help much. But when the sky is completely dark, your headlights will be visible na so wala na yung 'twilight' problem. My rear glass is on OEM05 to minimize the glare from high beam tailgaters