I have two HDS-7 with structure scan and I'm well pleased with them. bought the first one for Christmas of 09 and when the 4.0 update came out, I downloaded the 4.0 update and mine froze up. I called lowrance and they said send it to them, I did and I kept the face plate home. just wrapped it in a soft cloth and when I got it back, it had a new face plate " protective cover " with it. I haven't had any more trouble with either unit. and when I wash my boat the two units get the wash job as well. I have used HB units in the past and liked them as well.