Thank you @cafz on your suggested and thoughts regarding the charger. Appreciate!You'll get a choice of a few possible pickup times and have to schedule one of them.
I would get the Tesla wall charger - it's a nice unit, well built and great value.
I do not believe you will ever make back the additional cost of the Zappi through avoided grid imports. You can get most of the way there through scheduling charging for typical solar generation times; or, if you have a compatible inverter, the software solution of ChargeHQ.
(But start a new thread if you want a wider range of opinions, this thread isn't the best place for broader questions like that)