didn't use it personally yet but I just started exploring Zenni Optical myself, and I must say, I'm amazed by the incredible savings they offer! I'm actually planning to have an eye exam at a local hospital soon, and once I have my prescription, I'm definitely going to order a pair of progressive prescription sunglasses from Zenni. I've heard that the total cost, including the exam and the sunglasses, will be around $50 U.S., which is simply incredible!