PPG glass IMO is cheap glass.....wavey, etc.
I have not had a good experience with it, but YMMV.

E30Cabrio - ? What is the purpose/need for you re: comfort glass.
If OEM comfort glass is not available stateside *assuming* your glass guy is not feeding you BS, I would still rather get a Pelkington, or the latter and have a high quality tint put on the car.

Not exactly ideal, like the CG with the laminate in the sandwich , but you can always get something like V Kool installed