Definitely provides quicker ramp times on Superchargers, but I'm hoping they will have a feature where you can opt out of on route battery warmup. Don't get me wrong, super happy they added this feature, but I'm not sure it's necessary 100% of the time.
I can understand why you might want to disable it, to pay for less energy. But for Tesla they want every car to charge as fast as possible so that the turn-over at the Supercharger is fast so they have to build fewer stalls. So I would not expect them to make the feature optional.
Of course you can just set your destination to somewhere near the Supercharger instead of the Supercharger itself.