I just got the Ray Marine Dragon fly.
Not a bad unit, like the down imaging. Looks like a T.V. picture when you go over something in the water.
A friend has one and after he spent a season with it, can identify fish species with it!
Only problem is no way to put a trail on it.
I also run a Lowrance 4HDI.
Not a bad unit either, kinda hard to use (reminds me of the old D.O.S computer program from the 90's) open a screen, options, open a window from that.
I keep one on charts the other searching for fish or??
When I get somewhere, one is sonar, one is down imaging.
My advice is get a bigger screen than you THINK you need!
They all look BIG in the store, but somehow they shrink on the boat!!!
Was told (West Marine guy in Watertown N.Y.), that Garmin is easiest to use.
I THINK once you get one and spend some time with it, you stay with that brand.
Joe
As always, take any advice I give with a can of beer er 2