Joe, the Kenmore has an infrared sensor (opposed to a microphone found on Hoovers with the same feature) just inside the bend where the hose meets the back of the cleaner, where the bag inlet is. Many people think it's a gimmick, but I think it works well, and I enjoy using the one on my Windtunnel. You know, if you take the hose off that vacuum, there's a sensor that will stop the brushroll.... and if you suck up something too big, instead of breaking, it will just trip an overload much like a canister's power nozzle. Hit the button and you're back in business. Very nice!
The ones we sold at Sears didn't have a gentle feature for the brushroll.... maybe the Panasonic version did. I "forced" a friend to get the Panasonic version... she needed a good and relatively indestructible machine and I saw one for 25 dollars... of course she had to drive an hour to Tampa for it. It has stood up pretty well, but the last time I visited, her nieces had managed to break the handle release and it was clogged through the length of the hose with packing peanuts! Goodness gracious! I like the Panasonic because it has a squeeze trigger for activating the power, or that feature can be turned off and the regular power switch can be used... also has a cord retractor, which was rare for an upright when those were made. It lacks a height adjust, however, and that bothers me. When I worked at Sears, I sold one of those purple Direct Drives to an aunt and uncle and they still have/use it today. They only bought it because my aunts favorite color was purple... they replaced a slowly dying Hoover Runabout and Fantom Cyclone XT with it. It was a 300 dollars when new, but went on sale sometimes for 249.99.... when I sold them for Sears, they were being compared by shoppers directly with the S/P Windtunnel.... based on power, noise level, apparent quality, smoothness in pushing, and the better commission, I always pushed people toward the Direct Drive. If they were on the fence, I'd tell them the WindTunnel had TWO belts, and the Kenmore had NONE... that settled it!
Let's remember that the word Progressive refers to a whole series vacuums, both canisters and uprights (it was their high end series, Whispertone being the lower end). I like to refer to this machine specifically as the Direct Drive because it sets it apart from other machines in the series.
The last time I dug for bags, I came across the sales pamphlet that we had when I sold these at Sears.... if I can find it again, maybe I will try to figure out how to use the scanner part of my all in one printer and post it.