I have a Hummingbird Matrix 17 fishing system.
I really like the simplicity of this unit along with all the goodies. I did not buy this, as this was a gift from a friend.
What I really like about this unit is the large 320 vertical pixal display with the duel beam transducer(60/200). It has speed and temp. The cool thing about this unit is that you can hook up any brand hadheld GPS or the GPS unit you can get from Hummingbird or the weather sense monitor. It allows you to use the sonar screen rather then the small handheld GPS screens.

It has all the other standards such as split screen depth and fish alarms. It has 2,400 Watts peak to peak with 1,00 ft max depth.
It also comes with the quick disconnet so you never have to fuss with any wires or knobs, just push the back and it pops out ready to go.

It is also water proof and it floats, incase you drop it in the water.

If I were to get a new one, I would either go with a Matrix 67 (which includes everything, except for color screen) or the Lowrance X100 because of the TFT color display.