'04 suburban ride with 20's vs OEM 17's

Just wanted to find out from others who have a suburban with 20's how the ride is in comparison to the OEM 17's??

I know I can expect a more rough ride but how big is the difference?
Very noticable or not that much.
This is on a '04 LT 1500.

I see alot of them out there with 20's so I guess it can't be too bad.
We do mostly Freeway driving and during football season we make many trips to Norman so I am concerned with the long ride.

Comments???

Thanks in Advance,

Chris