The Humminbird ONIX units have had software bugs, but a few large updates that have come out and fixed a lot of those bugs. The bugs deal with a lot of stuff us trollers don't use anyway. Traditional sonar, GPS, and Radar all seem to be fine. We'll have 3 ONIX on board in 2015.
I have my two 1198's up for sale if anyone's interested. They have 2 seasons on them, and the only thing used was the head unit. Everything else is brand new in the box.