I have a Elite 7 HDI. This unit has never shown DI as avertised. After several calls and excuses and " try this, or try that" my unit is out of warranty. Lowrance wants $250 for a refurb unit....Just to be able to get DI. I am sorry but at this stage DI is not worth $250. Also what was wrong with the refurb unit,was it repaired, or is this just a way to keep the customer paying. I am sure that Lowrance , like Humminbird and others make quality units and that I just got a lemon. Right now I don"t have any warm and fuzzy feelings and would have to do a lot of soul searching to go with this brand. If I had more than problems than DI, maybe I could justify in my mind the cost, but almost half price is , in my mind, a little steep. A lot of fishermen have units that cost......BIG.... money., but $600 bucks is BIG money to me..... crappie1133