I've been using Macs since the little tan box that people now use as fish bowls so I wasn't surprised that this MacBook is fast and convenient. The battery lasts much longer than I expected and charges relatively quickly. Being a fireman's wife, I check for heat both on the charger and the computer case while it's charging and don't detect any. However, I never leave any device charging when no one is around. That's just common sense. It's lot of computer for the money and I'm happy I bought it.