I have a Simrad NSS EVO2 7. Fantastic sonar, chart plotter, instrument display, ect. Super fast response time (for the touch screen - works when wet) and completely configurable windows. Chirp sonar works fantastic (super clear picture). I have the wifi unit (is included with the GO9 - I think) so I also send the screen image to an old iPad I have mounted under the hardtop (you can also send to Andriod or an iPhone). Very happy will Simrad. Same interface as Lowrance pretty much. I guess its all personal preference in the end though.