Product review (5 stars): Trim per the instructions and it makes all the difference!
Arrived on time. Trimmed to fit my oven per instructions.  My exposed heating element has small metal parts that touch the floor to hold it up in the front of the oven, so I also cut out around them so they aren't touching the liner as they get hot from the element.  So far has worked great. No odor.  I had another type of liner and it sort of melted/stuck to the bottom of my oven (did not make me happy).  I'll be keeping an eye on this one. but so far has wored great.