This has been sold...
Replaced by this.
The short version is that the installation work is considerable, but it is MUCH quieter, easier to use, delivers 50% more BTUs, and consumes 23% fewer amps. Best of all, it does not leak rain, freeze the person sitting under it, snag sheets, or block the helm view. The weight is slightly less and is carried lower.It actually takes a little more space, just hidden in lockers. Fortunately, I kept the lockers pretty cleaned out, so I still have far more storage than I need.
Detailed write-up coming to Good Old Boat Magazine. Meanwhile, if you're looking for AC, I've got nothing but good things to say about the folks at Dometic. Great unit, great tech suport (I had no trouble with the installation, but I had a lot of tech questions for the article).