I have just been using my silicone baking mats and my jelly roll pans.
It has been working well. But I really thought I should have the cookies sheets. I tried them. And you know what, they made my cookie a little more crispy than I liked. They were still good, but I just liked them so much better when I baked them on my jelly roll pans. They seemed to stay softer.
That is my kitchen tip - try to bake your cookies on a jelly roll pan with a silicone baking mat. See if they turn out even better!