I know almost nothing about scooters but am considering getting one now for my husband. He is less able to kick well if he has to cross a current, which will close off a lot of potential dive sites for us unless we can find a solution, such as a scooter. He wouldn't need anything fancy, but I wouldn't want to get something that wouldn't do the job either. Can someone make recommendations and/or tell me what characteristics to look for? Also, are scooters allowed on most dive boats? I've never seen anyone with one, so that makes me wonder.