I've been an IMR customer since my first Panasonic NCR18650B purchased for my first modern flashlight almost 10 years ago. Since then I've ordered all my lithium cells from IMR and I've never had a single issue with any part of the process. The website, the pricing, the shipping, the packaging, the cells themselves, have all been perfect every single time. I've never had the need to find out what the customer support is like, although I'm sure it's great. IMR is my trusted source for batteries.