Summary: I upgraded to the 788ci HD DI from the the 597c I purchased in 2011 for almost the same price. What a difference three years make! This unit does everything they say is does. The down imaging is amazing to watch and a power tool. I highly recommend this unit.
Summary: So far I have been using it as an ice unit, and it works great for GPS and fish finding. I haven't been able to test down imaging yet. I'm not sure the color feature is much better than mono but I've only used it six times so it may grow on me. Sensitivity seems good you can pick up very small lures down 85' with no problem. I'm happy with this purchase.
Great reputation,will use next year.Exceptional buy.
1 December 2013
Summary: Recently purchased two Humminbird 788ci HD DI Combo units.Have not installed them yet. Open water season is over for me.Our local Lund dealer has installed alot of them and he states they work well.Got an exceptional price through eBay and will try them out next year.Humminbird seems to predominate in our area;ease of use,good map card performance and good map options available,units perform well, based on comments from other users.Probably at least 4 stars.