I’ve only used 1 site. This isn’t first time buying from a different merchant. Couldn’t express how impressed I am with their customer service! Replied to my email within the first hour! Then replied to my second email minutes later! Also was able to use a 30% discount code for my first purchase. Winning. I still have a full kit of grey caps but when I start on these kits I’ll be able to share how I feel about this product. But from the customer reviews I’m feeling confident.