My '06 is pretty smooth. I have no complaints at all. My '07 IS250 is a little smoother over bumps, but in no way have i ever been uncomfortable driving my G35x around at all

 

If you want a smooth ride...



j/k, but not really.

I think my sedan with the sport suspension is WAY too cushy, either that or my shocks aren't dampening as much as they should. Car seems slightly bouncy on bumps. It's probably great for old people and their hemorrhoids, but there's not as much response from the chassis as I'd like.

 

It's all relative to what you are used to driving. Coming from two SUV's and an F150...it's like gliding on air. My friend who drives an F250 was riding in it the other day and commented on how he was about to fall asleep because it was so quiet and smooth.

As others have mentioned though, it is a sports sedan so the suspension is supposed to be somewhat stiff for handling purposes.

 

The G is a little over ok i guess, the first generation had a more emphasis on sport than luxury. I had friends who have acura cl's, 350z, and evos and they think my car is like riding on a cloud. My 99 lexus es300 had a smoother ride and was more spacious inside than my 04 G.

 

The 20's will generally be a rougher ride. Also if you go back to stock wheels the type/model of the tires will definitle affect the ride. One of the car magazines just did a test of tires and the road noise, roughness, etc varied quite a bit. Don't remember which mag - Road and Track, Car and Driver, something like that. My car is a lot sportier and not as nice on the freeway as my last car (Aurora).