I have the 1" front and the 7/8" rear swaybars.   I drove with the front for a while and the rear swayed a bit.  I put the rear bar on and went driving on some mountain roads.  It was from Messa AZ to the Grand Canyon.  I was able to take the curves at 75~80 with little sway.  Adding the rear helped to balance the rear and keep it from leaning in the curves.

Putting them on was not too difficult.  If you want some pics I can send them to you.

There will be 6 holes to drill. It should take about a couple of hours.  Get some paint to paint the drilled holes to prevent rusting.

Robert