We have the Simrad. It is the GO5, and if I had it to do over, I would go larger with the screen. That said, we like it fine. We use it for navigation - lots of shallow areas on our lake, and it is a good reminder at a glance. I hear it is not ideal as a fish finder, but we don’t use it for that so that hindrance doesn’t impact us. I really like its chart/navigation features and data features.
IF you have a Mercury, with an add on connection, you can interconnect your entire motor data system into the Simrad. We went with the Mercury VesselView and linked to our phones instead because it is cheaper.