Yes, I would recommend it for inboards. The system is pretty flexible and covers everything from huge cruisers down to PWC.
My Calabria Pro-V is on the "C/B Model" with the added inboard protection mat. The mat ties to the bags to keep the skegs from popping the bags. The prop has never been an issue in my setup.
Yes, the hull is entirely out of the water when the bags are full. We've even done a prop change in the water with the boat on the lift. One complaint that some people have, is that while the hull is out of the water, it is in contact with the bags over a larger area than the bunks of a conventional lift. Some say this leads to the need for a little more cleaning on occasion...but I find that a day of floating around out in the Delta puts more of a grunge line on the boat than sitting on the lift in contact with the bags for weeks.
Raising and lowering seems to take about the same amount of time as a conventional lift, but you do have to pay a little more attention as they fill because you need to fill the three parts evenly.
There is a dealer network you can buy through that will provide installation. I bought direct and did it myself. The first round was a disaster...but only because we didn't follow directions. We thought we 'knew better'. The owner of Airdock is available via cell phone...weekends, holidays, whatever. Support was great as he talked us back through doing things correctly and it has worked perfectly ever since.
You'll need a buddy to do the install and you might get wet...but you can do it from a typical dock/slip/marina.
If you need to pull the lift out for a season, you can suck the air out with a shop-vac and roll them up pretty tight.