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Wow first Ive heard of this. Maybe it's really something else.

Update:

No shrinking or warping.
No smell.
No enclosure required.
Build plate can be heated or not (depends on brand).
Can be printed on glass without any glue*
Does not absorb water or...

And most of the reports I've seen have said the warp is even less than PLA.

Here is a summary of PET:

Also known as polyester
No shrinking or warping
No smell
Does not degrade in water
FDA approved for food contact
Does not absorb water
Not brittle
Is the most...