I have purchased and upgraded using various brands and types of LED’s and on several vehicles. These Underground LED’s are, without a doubt, the most impressive I’ve seen. Specifically, this purchase was for a Chevy Traverse, and after trying another brand which hyper flashed in spite of their claims, the Underground install and function is flawless. I also purchased Underground 7443 tail/brake/turn led; these lamps (as the 3157) were impressively bright, but brightness is, I think, often discussed and emphasized to the point of missing the importance of light distribution. In particular, the 7443 led’s are such a “fit” in all senses of the word one could think they were engineered for this particular vehicle! They somehow maximize the light assembly reflector shape for unbelievable “special effects". While cosmetic appearance should never be a first priority, to have such a beautifully patterned lamp with clearly distinguishable individual diodes refreshes and renews this 2011 car. Safety first, improved visibility (light distribution, brightness and overall effectiveness) is hard to measure subjectively, but I believe 200-300% improvement over factory original lamps. This, combined with the impressive appearance far beyond any uprade LED’s I’ve seen, makes this purchase and value exceptional in all respects.