Hi everyone wanted to get some input on Torpedo's dpv for moving sand. I am going to purchase one because I metal detect underwater and when fanning holes for the goodies it keeps caving in on me!! I am going to purchase the Torpedo brand because I have heard such good feedback about this machine. Only problem don't know which one to get, there is one that goes 2.0 mph, 2.5 mph and one that goes 3.0 mph and the batteries only last so long the stronger the push on the machine. Any input would be much appreciated!!