I've used the Premiere Bakeware half sheet 3 times so far.  I like to cook bacon in the oven with parchment paper and with this being non-stick the clean up is a breeze afterwards.
The dimensions of the pan are 13x18 but you should measure your oven closely because I have a wall oven that it is a tight fit in because of the handles on each side which make the pan approx. 19 inches wide at the handles.
It is a nice thick pan and I don't see it warping, high quality.