 We purchased the M35 since it was such a great value at the time compared to the Mercedes E350 we almost bought.  The M35 feels solid with predictable handling, and the optional technology and advanced technology packages round out the car well.  While not as quiet and smooth as the E350, it's a solid car with respectable performance and comfort.  Reliability likely won't be a concern, with a standard 60K mile warranty.  Wind noise is somewhat noticeable at highway speeds, gas mileage a bit disappointing, and the performance tires transmit some road noise into the cabin.  But for the deals that Infiniti is offering right now, it was simply a no-brainer.  A fine car and a no-regrets purchase.