When I had my son, we struggled with the logistics of how best to give him night feeds without going downstairs and waking visitors and our dogs! This product was recommended and it's been one of our best buys.
Like many of the best products, it's actually not a very sophisticated gadget. It basically consists of a cool box with ice pack and a bottle warmer stuck to the front of it. The cool box is detachable with a handle and the bottle warmer is super fast, quick enough to heat the bottle in the time it takes me to do a nappy change.
Others mention bottle compatibility, I use the Avent bottles and they fit perfectly.
Only one complaint, it comes with a really short power lead, which means you'd have difficulty putting it on a chest of drawers without an extension lead. A minor grumble though as it's a great product at a great price!