Actually, I'd love one. Many times my trailer use is for the sole purpose of having a place to sleep during a weekend of fishing. If I had one of these, I could stay on the water and be fishing off and on all day and night.
No, it's probably not for the full timer or the person who travels great distances for extended time periods. But if you lived in an area surrounded by good lakes like I do, it has its merits.
The one thing I saw immediately that might get old quick is the amount of steps it takes to get up and down.