I, too, was on the fence about adding them to the order when we ordered our 2861, but I am sure glad I did! Like others have said, the stabilization alone makes a huge difference, and the 10 minutes saved not playing with the giant legos is just more time on bottle (wine that is). There is also a certain satisfaction that comes from watching our empty rig contort to perfect level like a posessed low-rider! Not sure if it would be a deal breaker for me on an outstanding deal, but I would recommend to anyone that they opt for the levelers if it is an option.
The next time I do a one-nighter I am going to try not to push that auto level button (going to be tough) and see what a full day without being level and stabilized is really like. Sadly, it looks like it may have to wait until Spring as last weekend was a little colder (34 degrees) than ideal for us.