I finally picked up my Zero S ZF14.2 today. It was not cheap. Shipping and set-up charges were $700 (distance to factory is about 90 miles, but I assume that is a flat-rate charge) and I was charged an additional $220 for the installation of the power tank. So I guess the work took about 2 1/2 hours to perform. That seems reasonable considering that it was not a drop-in, like the photo on Zero's website seems to suggest, showing someone placing the battery module into the storage area under the "tank" fairing. The module is not removable by the owner and becomes a permanent addition to the bike. See attached photo showing the "tank". My feeling is that it could have been installed a lot easier and quicker (and less expensively) if the battery module was installed at the factory as the bike was constructed.
For my purposes, the power, even in Eco mode, seems quite satisfactory. When recharging after returning home, the charger maxed out at 1400 watts. The suspension seems to provide a smoother ride than did my 2012 bike when new. Perhaps that is the result of the 100 pounds additional weight. You can feel the additional 42 pounds while riding slowly and pushing the bike around. Unfortunately, the steering head bearings seem to have been overtightened at the factory, resulting in an irritating weave at slow speeds. If the bearings don't loosen up by the first servicing at 600 miles (and I have no reason to think that they will), I will have to have them adjusted by the shop.
Now I have to contact my insurance company and email the CA EV rebaters to see if they will give me the full $900 rebate, or will nick me $300 for not keeping my 2012 bike at least three years.