Hardly perfect - IS300 takes over 8 secs to 60 and produces rubbish mpg if you have a heavy right foot. As for IS200, close to 10 secs to 60 and zero performance under 4,500rpm which means mps also stuffed if you want any kind of performance.
This is my point, I would not go near an order form until I had driven the new engine as there would need to be big improvements before I bought another lexus.