I have a Zulu 2 from 2013. The cost of upgrading it to a Zulu 3 is 400$. Gets an extra 1-2 years of warranty. What they do for the trade in is to replace the control module, cables with Kevlar cables and replace foam parts. Everything else stays the same.
Is it worth upgrading? Or should I just buy some sugru and fix the parts around the joints where the rubber molding is breaking apart?