It's pretty nice. The key is to have a high enough wattage USB that you can feed it over 50w for a quick heatup, in my experience. I use a fast charger brick I

It's pretty nice. The key is to have a high enough wattage USB that you can feed it over 50w for a quick heatup, in my experience. I use a fast charger brick I bought for my phone and it works like a charm.