If an Ultrex has the Mega SI ducer built in, does that mean it's one of the brushless motors? Are all MSI's brushless? The one I have on my boat, was on my boat when I bought it, but the guy said he put it on this spring. He said the same thing about the Solix unit and I checked and it had 10 hours on it when I checked the hours, so that wasn't a sales pitch. I do know that I fished all day last Saturday and didn't charge the batteries and had over 1/2 charge according to my remote when I went yesterday afternoon.