I'm hoping Kush will pipe in here - he runs an 11 -12' raft with Yammy jet on it. I used to run one as well - a Zodiac-like 11' with 25/20 MercJet.
The biggest problem is they're Squirrely. No rigid bottom or keel - without the prop to provide "bite" and tracking they get blown about by wind, waves, etc. Beware sticks, sharp rocks, etc in the water too.
Given your awareness of their limitations, they do provide adequate transportation for flying anglers who need to get from place to place on remote river systems.