You don't need wifi, to be honest. it's a waste of money, and just doesn't work. looks like it never will. And don't expect stellar support. These guys haven't EVER updated the firmware.
It's an interesting cooking technique, but food cooked with real heat tastes totally different. The chemical reactions that take place when you you use proper heat create a myriad of complex and interesting flavours you just don't get with sous vide and never will. And simply browning the outside is simply cosmetic, and doesn't really impart any flavour.
I hardly ever use mine, and when I do, like today, I'm always disappointed that so little has happened to fix the problems and update the firmware.
My advice? Don't bother. It's just another gadget that'll sit in your cupboard most of the time.