I’ve got an Onix 8si. There was a software update along the way that helped a bunch. Pros and Cons vs my buddys Helix G2N si comparable model.
Touchscreen is nice. There were some other nice features for customizing the view that the Helix doesn’t have. Few other differences I can’t remember. Helix had the 3 hot buttons for views, if those didn’t make it into the Solix they should have.
Worth the money???? Total personal preference.
fwiw, Helix had some software problems of it’s own. Notably bad shallow water readings with hard bottom. Really makes a mess of mapping. Heard that might have a fix last fall but haven’t tried it yet.