I can't advise on the attributes of the Stable Lift, as I've never used one. However, I can attest to the quality of the Atwood jacks on my 04 Lance 1121.
For the first 6 years, my camper was used extensively for business travel to the tune of 30-35K miles/yr. 200+ nights/yr, it served as my motel/restaurant/office. I arrived at a campground, unloaded the camper and used the truck for 'round town transportation. Moving every 4 days to two weeks, I can't tell you how many times I've loaded/unloaded. For the past 3 years, I've full timed in my Lance to eliminate a lot of mileage and stress of working all over the east. Staying in one spot a little longer obviously reduces the loading and unloading and a blue tote comes in handy at government campgrounds. In two months, retirement kicks in and all this will change.
I relay this story to indicate how often I've depended on the camper jacks. I've had one jack failure, caused by an unknown vehicle clipping the jack while the truck and camper were parked at a supermarket p/l. While the manufacturer, Atwood, wasn't helpful in getting me a quick replacement, Lance had me back on the road within a week by shipping one to me. Kudos to Lance.