I've had both the IS200 and the IS300.
I sold my IS300 in April ... and do I miss it? = Yes.
It was a lovely car, with everything right about it ................ apart from the running costs!
Petrol ... isn't the best, especially when you boot it .... plus the insurance for me wasn't the cheapest.
I'm looking at other cars, and the 'only' reason I wouldn't get another IS300 is because I've been there done that ....
But, in general .... it's the ideal car.