Basically the steering is crisper at speeds over 20 MPH, feels more responsive and it tracks down the road with less effort on the steering wheel at higher speeds. These differences became very noticeable in the first drive back home after they were installed. I suppose the steering effect is due to the inertia differences due to weight between the original heavy steels and the lighter Alcoa's. Apart from the looks which is improved greatly, they appear to be functional by contributing to the overall feel and handling of the coach.
I already upgraded the front sway bar (Roadmaster) and steering stabilizer which improved it very noticeably. Had the alignment done at the same time. My rig has the J-Ride Plus with the Helwig rear sway bar and helper springs which I did before the Alcoa upgrade. So it seems with every upgrade, the ride and feel just keeps improving.
Last on the list will be the SuperSteer rear trac bar which is on order now. Many say this piece by itself is a stellar upgrade as well, so we will see.
I also plan on getting rid of the Hankook tires that it came with and installing 6 Michelin XPS Rib tires instead. Reason for this is less chance of tire problems especially in the middle of Highway 50 in Nevada where the nearest town is 50 miles away. Peace of mind is worth a lot.
Otherwise for a brand new rig, this Entegra 29V is awesome and we have not had any issues with it other than fixing the door draft with weather stripping from Home Depot. The new V8 7.3 is a champ!
Hope this helps