I love mine. I've owned IS200 Sports since 1999 so this is a bit of a change. Today I took her round my usual stamping ground with gusto for the first time and I have to say I was impressed. She felt far more stable, and that's "far" with a capital "F". It's a completely different car. Much more solid on the road. She holds the road like a limpet - my old '200 Sport was scary by comparison. As for pulling out from side roads - I beat myself up about having an auto, but I am so glad I did. 0-40 on a busy dual carriageway in no time at all and no worries about stalling/mis-shifting.
All in all I feel the IS250 is a better car than the IS200. That's not surprising because the IS200 is an "old" car - I had my first one nearly ten years ago, and when I dropped my last one off at the dealer a couple of weeks ago, she was still as good as the day I picked her up. The IS250 is a different beast. You sit in it and it wraps you up - you don't sit on it. Sad to say, the IS250 is the BMW 3 Series the IS200 should have been from Day One.
I love it. In fact, I love it a lot. I don't miss having to change gear. I love having rain sensing wipers, auto dimming rear view mirrors, parking camera and parking sensors. It's the dog's bits. The Multimedia option is awesome. My friends/colleagues have noticed that the lights go up and down when I start it up at night and they wish their cars had lights under their door mirrors.
I'm 40 years old though. I had my first IS when I was 31. A six speed box and sat nav was the be all and end all. Nine years on and I'm loving my auto box and flappy paddles when I need them (which ain't often!).
Would I have bought anything else? It's a simple answer. No.