I have two older Garmin Echomap units, one is a 73SV and the other is a 73DV. I love the units, they are very user friendly and are basically a plug in play unit, meaning you can plug it in, turn it on, and it doesn’t really need adjustments to get good images.
My only dislike is my units are the older ones that don’t have QuickDraw.
I am seriously thinking about upgrading to the 93SV UHD very soon.