Here's a scan of a 35mm frame of the PET based film. Other than the dust, I think this turned out really well. This was exposed and processed about a week and a half ago as a single frame cut from a coated sheet. The rest of the sheet was used for 6x9 negatives. Straight out of VueScan.
One thing that I will note is that the left side of the frame has begun to detach from the base. The right half has not. But, the left side is where the film was cut, the right side was not cut. I didn't see any detaching in my three 120 6x9 negatives, though.
So, I guess there are still some things to work out.