@rpegg I am a pro purchaser. I imagine that the software/hardware interaction will need to be very exact when using the pass-through slot and the double sided cutting will require similar exact interaction. I was expecting, lacking any caveats placed in the “Tech Spec’s” section, that you could cut something like the tree in my post here out of 1/2 in. (12.8mm) thick material. This ability to link the camera on the laser head to material position will need to be very exact for it to be useful when cutting.
They say “[cut] twice as thick by reversing and cutting from both sides with optical alignment”. They do not say anything else. I would think that if I cut a circle in one side of a piece, that if I flipped the piece over, that the Glowforge could cut out the other side with the same precision.
I think that this would be very hard to do. Which is why when they advertised it, I wanted to buy it. Except for @julybighouse post above, I have not seen any limits placed on the double-sided cutting promise in the advertising video.