We bought our first hullavator about 12 years ago and its still working, although a little stiff. I should also say that it suffered partial salt water inundation during superstorm Sandy. We purchased a 2nd one about 7 years ago as my wife and are now in our late 60s. Couldn't load my 60 lb kayak on my SUV without it.
This item is very expensive, but it's cheaper than another round of back surgery.
I do not leave it on the car, so it is protected in the garage most of the time. I hope they continue to serve us well.