I've played a bit with it too. The DeepThink looks cool. It was pretty interesting to see it write: "but wait..." and each time go off on a tangent. It didn't improve much the quality of its response without DeepThink, but all in all, was a better experience than the completely free ChatGPT model. And the question I asked would have required really advanced reasoning to give a good answer.

Will try to use it as my default this week and see how it compares in terms of coding productivity.