I am 'gulligirls' husband that just bought her the 450,
I had her test drive both the 350 and the 450, (I did not drive either one)
and I sat in the passenger seat. The difference in the overall ride between the two was very obvious to me. The hybrid rides much smoother, (obviously because it weighs more), and of course, very quiet!
We are in Clovis, (CALIF) which is like living in an oven, so the air keeps the engine running much of the time when vehicle is not moving. Anyway, our orientation lasted 2 hours, in the heat, ran around the rest of the day, then we took off for San Fran the next day, doing 70-75 most of way. I had to fill up on the way back, and thought oh no, here goes 20 gallons,HA! it only took 12 gallons so my first tank I got 27 mpg overall, I'm very happy!
I am a very heavy footed driver, but now I find myself playing the 'keep the engine off' game!
And my wife? she loves it!
She's already sewn a cover for the center armrest in front so the leather won't get discolored from body oils!