I've got an 08 35GS and it has been basically flawless. Hopefully your unit will have the same chassis under it as mine does which means the 19,000 rear springs so no need for super springs. We did have the NORCOLD door issue and we had issues with the radiator which has also plagued some other owners. As to handling all we did was added the Henderson rear track bar to help with the tail wag. I am able to drive very relaxed and have no issues with passing trucks or wind. Currently at 50,000 + miles.
Enjoy your new rig.