I noticed something on the configurator that they need to fix; if you click on any of the roof rack options, you can't go back to it and un-check it.Nice. It will be interesting to see what functionality it brings. I would hope it would display speed, but also mentions connectivity to blind spot cameras and backup camera too. From the picture it looks like it supports display of navigation and speed but that could just be a random mock up.
Also, I see there are now options for bike/surfboard/ski roof racks ($136 - $188)!!!
And a custom car cover option for $178. After looking around at custom covers for the Miata, that is actually not a bad price assuming it is good quality.
So make sure you want it first before you have to start all over until they get the bug fixed. (Oh wait, could that be considered an option?)