I am on my second Kendon lift and I think that they are great!
I picked both mine up off craigslist so they were not the newest versions but were much cheaper than new ones. Mine both exhibited the front tie down problem that is not a big deal (the newer ones may have fixed this problem). After I wheel the bike on the lift, I secure the rear of the bike with tie downs and then raise the bike. Then depending on what I am working, I will add straps to the front and remove the rear ones, or vice versa.
The pictures below are of the first one that I owned which had both air actuation and manual operation. I currently just have manual operation on the lift that I now have. These pictures also show the accessories that are available for these lifts - side work surfaces, oil drain pan and motor jack - none of which I found to be particularly useful. Floor space is tight in my garage, so the foldup/standup feature is what sold me over a standard platform type of lift.
They are nice lifts, but overpriced if you are considering a new one. I bought my first one for $650.00 and sold it after I found my current one for $250.00.