The cruise air unit is heavy, expensive and doesn't work any better than a $100 window unit stuck through a hatch.
Like several boats in my marina, I have adapted a small window unit to cool my boat at the dock. In my case, I can sit the unit on the cockpit step facing into the companionway. I cut a piece of wainscoting to match the companionway opening, then did a cut out for the window unit. I have just enough room to squeeze by without moving the AC unit. It takes 5 minutes to set up, and the total cost was just over $100. On the hottest days of summer last year, (over 100) it kept the interior tolerable. On a normal day, it keeps the boat quite comfortable. Other nearby boats have devised ways to mount a window AC, so it blows in through a hatch similar to the cruise air. I just cant see paying 6-8 times the price of a window unit for the Cruiseair. As others have said, there are a lot of them on the used market but even then they are 2-3 times the cost of a new window unit that will cool just as good.
I did have to replace my unit after only one summer, but only because I'd stored it in our deck box and it was totally submerged by a hurricane. This time I'll store it on the boat and move it to the deck box when we leave the dock. It's much lighter than the cruise air unit for the same BTU's, if you don't mind looking a tad West Virginia.