Hi Sunbeam,
I'm currently wearing my Reverso GT. I find the size perfect.
On the contrary I'd be happy to wear a larger sized (and similarly thick) Reverso that would be more easily readable and that would sport a more modern calibre.
I like the 976 size a lot, so I may get one in the future (or another model with the same case), but that's me.
If you doubt and think the GT could be too small you should indeed wait and see the new size. If not take into account that the new size is really much larger than the GT.
Regarding the see-through back I would indeed have preferred a plain back.
The calibre is still a modern and robust one, and I like the large balance and the technical features. The finish was seemingly nice on the prototype, even if that's not easy to see on our pics. I hope to see soon a production piece to confirm.
Cheers
Dje