The fabric is supplied in a DIN A3 as big package - thus he has in the delivery condition wrinkles. I got it at a small corner tried: With steam the wrinkles are passe. But by the length of 6m one has place his model to be positioned a little way in front of the background, the fillet - then no wrinkles can be seen, at least not with a not too tight focal length and small aperture.
The material does not smell, is therefore directly usable.
Reflections I have not observed, not even at a higher flash output.
It is light Transparent, so the background is hanging in front of a daylight window do not work. Possibly a white background is not shine through but, even if it flashes.
