Just a word of warning: I used to have Bridgestone ER60, even though they didn't have much profile left they were pretty good. Good grip and handling. Then I switched to the XM2. Grip... nah, not really. You brake hard, it blocks up. Corner hard, car will just go straight. Advantage: Slightly (really slightly) lower fuel consumption... I guess. The difference is so small it's hard to say. Road noise is also reduced. But really, the lack of grip is a bit scary (though now that they are worn in it seems to be a bit better). In the wet they seem to do just fine, no problems so far. Although the car just kept moving forward in my car park once... the tyres were still wet from outside at that time.

One more thing: I was always wondering why there are so many idiots driving in my car park with squeaking tyres. I tried hard with the ER60 (when there was no one around), but no matter how fast I drove I could get any noise. With the XM2 they basically always squeak, even at low speeds.

So yes, they are comfortable, they'll probably last a long time, that's all good. But they seem to be a bit lacking in the most important department, grip. (Again it seems to have improved a bit, but I was happier with the ancient Bridgestone).