I've got a Riptide ST with copilot/autopilot. For about $700 I can upgrade it to I-pilot link w/bluetooth apparently. That would get me basically everything- I think, The speed control, spot lock, follow contours and tracks ( I have a Helix 9 with lakemaster).

But I would really like a new ulterra. Aside from the obvious auto stow/deploy, what would be different from just buying the upgrade package for my riptide ST? I've heard the turning motor speed is better and quieter on the new units, is there anything else I should know to help with my decision?