Regardless of make I suffer from the upgrade fever. When Humminbird released the Solix I started saving for it. Got impatient and got the Helix 10 G2N MEGA instead. This 1500 dollar investment became a headache. Had several problems with it and have solved some work arounds so I can at least use it. From what I understand from extensive research, the Helix G2 's and Solix's are suffering some common problems and some not in common.
One of the more common problems incorrect depth readings. A promised update has yet to be released to correct this. When the Onix was first released it suffered numerous software glitches. Years after their release I guess they are fairly stable now.
If you are completely satisfied with your present system. I would hold off until present problems are finally solved with these newer lines. If not once the headaches are dealt with. You might want to buy then
Garminarmin gpsmap 1040 xs networked with Garmin gpsmap 1242 xsv , Panoptix PS 30 and PS 31. Livescope LVS 32
Ice rig Echomap Ultra 106SV with LVS 12 and GT10-IF