a few recommendations on the scooter if you're looking for one. on a float tube you definitely want positive buoyancy. i think a floating scooter makes things a lot easier. also check out the weight, size, battery life, and speed. easy access to the controls is also a plus. if you plan on using it just for tubing, dont even bother worrying about depth rating unless you often get the urge to do some open water skin diving.
the aqua ranger is decent. it does feel a bit big to me. it's an overnight charge which bugs me a bit. profile is kind of big. weight wise it is about the same as some higher end scooters. the latches are solid but changing the battery is sometimes a pain--especially on the water. speed isn't great but it is decent as well. the place i bought it from said i could get 1.5 hrs out of it but i think 1hr on the tube is about the limit. definitely love the buoyancy.
not gonna lie, i like this scooter but it's definitely a lower end, entry level machine. it does the job. it's pretty cheap, even when new.
whatever you do, dont get the sea doo dolphin. it's barely acceptable as a toy