I installed one on my Catalina 28MKII. It was a tricky install, and I had to have some brackets fabricated for me locally (at a reasonable cost). I'm very happy with the unit.
Yes, there is an exposed belt, but to suggest that the exposed belt poses a risk or hazard is an exaggeration. This isn't the alternator belt on your diesel, it's a lightweight toothed belt under low tension. It would be easy to rip the belt off the large pulley with just one hand.