Product review (4 stars): Im not sure but it seems like the liner blocks the heat somewhat
Have only used oven a couple times since utilizing the oven liner. My electric oven has a hidden element so I installed liner on lowest shelf, instead of oven floor,  as instructed. Im not sure but it seems like the liner blocks the heat somewhat. Next use I used the convection option so the fan circulated the heat. This seemed to work better. So, still on the fence about continuing use. Previous homeowner had liner on oven floor which seemed to work fine and Id prefer that. Overall, quality and value of product is very good.