there are huge differences in mats- and if using a rotory cutter a *self-healing* mat is a must...otherwise you will get deep (grooves) cuts in the mat fairly quickly and be replacing it. a self healing mat will last a long time as long as you take care of it- a mat that is not self healing will not last very long-will have to be replaced frequently if you use it alot. as for color/brand- buy the one that has lines you can see the best- some people like the gray ones- some like the green ones- and some like white ones- it's up to you what works best for you. you get what you pay for.....