I'd buy it in a heartbeat as long as there's no locking down of the software on it. A lot of these sorts of single-purpose devices go weirdly out of their way to be hostile to people modifying what software runs on them, which makes it all the more difficult to keep them working after, say, the manufacturer discontinues the product (or
itself). A piece of hardware without user-serviceable software might as well be disposable - and the last thing the world needs is more disposable electronics :)
It's also worth noting that if you're marketing this for use at work, not all workplaces use Google Calendar; I've worked for quite a few companies that used Microsoft's ecosystem (particularly Outlook) exclusively. For a first go at the software, then perfecting the Google Calendar experience is a reasonable decision, but per above, it'd be nice if those of us with the know-how could mod in whatever data sources we please.
A couple questions:
1. Is this wall-mounted only? Or will it have some kind of stand so I can put it on my desk? Apartment dwellers and open-office-floorplan workers would probably find the latter useful :)
2. Would I be able to sync multiple calendars to it? Or would I need to buy multiple frames (one for work, one for personal) if I want to have both my work and personal schedule on display?