The Midnight Black 3T almost gets too hot to hold when in sunlight for too long. One thing that concerns me is the heat when charging - Dash charging is awesome but if I charge it on my bed the phone gets really hot, which I'm hoping is just because it's summer time and quite hot in general during the night.
The heating isn't great, it gets hot in non-gaming tasks occasionally and even just being in my pocket. But I expect these to not be issues in the winter.